Try to answer the following questions here:

• What is this question used for?
• What does this question assess?
• What does the student have to do?
• How is the question randomised?
• Are there any implementation details that editors should be aware of?

Feedback

From users who are members of Transition to university :

From users who are not members of Transition to university :

History

Checkpoint description

Describe what's changed since the last checkpoint.

Christian Lawson-Perfect10 months, 3 weeks ago

Saved a checkpoint:

I've fixed the advice for parts b and c - the power should be $n-1$, not $n$.

Christian Lawson-Perfect10 months, 3 weeks ago

Gave some feedback: Ready to use

Ashley Cusack10 months, 4 weeks ago

Gave some feedback: Has some problems

Ashley Cusack10 months, 4 weeks ago

Advice for parts B and C is incorrect.

lucia ramsey2 years, 4 months ago

Gave some feedback: Ready to use

Christian Lawson-Perfect3 years, 10 months ago

Gave some feedback: Ready to use

Christian Lawson-Perfect3 years, 10 months ago

Saved a checkpoint:

Looks like there was an off-by-one error.

Deirdre Casey3 years, 10 months ago

In part b does not accept correct answer. Mistake also shown in the solutions.

Deirdre Casey3 years, 10 months ago

Gave some feedback: Has some problems

Christian Lawson-Perfect4 years, 1 month ago

Gave some feedback: Ready to use

Christian Lawson-Perfect4 years, 1 month ago

Saved a checkpoint:

Gave the variables sensible names and reworded some of the advice.

Published this.

Bradley Bush4 years, 2 months ago

Gave some feedback: Needs to be tested

Bradley Bush4 years, 2 months ago

Splitting into 3 questions with 3 parts each instead of 3 parts with 3 gaps

Christian Lawson-Perfect4 years, 2 months ago

And like the other sequences questions, the advice would benefit hugely from a table.

Christian Lawson-Perfect4 years, 2 months ago

Gave some feedback: Has some problems

Christian Lawson-Perfect4 years, 2 months ago

Saved a checkpoint:

The gaps are all set as "mathematical expression", but there's no reason they shouldn't be "number entry" (apart from the formula part, obv.)

The parts of this question aren't coherent; you could keep the same sequence throughout, and ask the student to:

• Find the common ratio
• Give the formula for the $n$th term
• Calculate a given term.

Hannah Aldous4 years, 2 months ago

Gave some feedback: Needs to be tested

Lauren Richards4 years, 2 months ago

• Make sure i) and ii) etc are in italics both in the parts and the advice.
• I think I would capitalise "Common ratio" in part a).
• Advice content for a) is fine.
• Where you have stated what the formula for the geometric sequence is in part b) of the advice, I think you should explain that a is the first term and r is the common ratio.
• Make sure you use displaystyle to make the formula large.
• Think there might be a slight glitch in the advice of c) where you are trying to figure out the common ratio, it says a[3]*a[4]^3 instead of 375 as it was supposed to be in this case.
• Typo in the last sentence of the advice - it says "we can write substitute them into the formula..." - "We" should be capitalised and just scrap write.

Lauren Richards4 years, 2 months ago

Gave some feedback: Has some problems

Hannah Aldous4 years, 2 months ago

Gave some feedback: Needs to be tested

Vicky Hall4 years, 2 months ago

It would also be helpful to give and exlain the formula for the $n$th term in the statement.

Vicky Hall4 years, 2 months ago

Gave some feedback: Has some problems

Vicky Hall4 years, 2 months ago

I have added a sentence to the statement to explain what is meant by the common ratio. I think part a) should include one sequence with a positive integer ratio, one with a negative integer ratio and one with a fractional ratio to cover all possibilities.

Hannah Aldous4 years, 2 months ago

Gave some feedback: Needs to be tested

Hannah Aldous4 years, 2 months ago

Created this.
Find and use the formula for a geometric sequence Ready to use Hannah Aldous 03/11/2020 14:54
Deirdre's copy of Find and use the formula for a geometric sequence draft Deirdre Casey 06/11/2017 12:40
Marte's copy of Find and use the formula for a geometric sequence draft Marte Bråtalien 12/04/2018 14:12
Joël's copy of Find and use the formula for a geometric sequence draft Jo Cohen 02/12/2020 15:42
Hallar el término general de una secuencia geométrica. Ready to use Luis Hernandez 02/12/2020 15:42
Simon's copy of Find and use the formula for a geometric sequence draft Simon Thomas 25/02/2019 10:50
Justin's copy of Find and use the formula for a geometric sequence draft Justin McGuinness 14/05/2019 15:02
Find and use the formula for a geometric sequence draft Xiaodan Leng 10/07/2019 21:48
Find and use the formula for a geometric sequence Ready to use Vicky Hall 07/10/2020 12:45
Sequences and Series - Find and use the formula for a geometric sequence Ready to use Apodytes-ATG apodytes 25/10/2020 18:53
Ashley's copy of Find and use the formula for a geometric sequence draft Ashley Cusack 28/10/2020 21:07
Geometric Sequence draft Johnny Yi 06/11/2020 23:19

Give any introductory information the student needs.

No variables have been defined in this question.

Warning

• When applying the function,
Suggestions
• Change the signature of parameter from to .

This variable is an HTML node. HTML nodes can not be relied upon to work correctly when resuming a session - for example, attached event callbacks will be lost, and mathematical notation will likely also break.

If this causes problems, try to create HTML nodes where you use them in content areas, instead of storing them in variables.

Describe what this variable represents, and list any assumptions made about its value.

← Depends on:
→ Used by:

This variable doesn't seem to be used anywhere.

Name Type Generated Value

Error in variable testing condition

There's an error in the condition you specified in the Variable testing tab. Variable values can't be generated until it's fixed.

Error:

for seconds

Running for ...

Name Limit

Penalties

Name Limit

No parts have been defined in this question.

Select a part to edit.

The correct answer is an equation. Use the accuracy tab to generate variable values satisfying this equation so it can be marked accurately.

Checking accuracy

Define the range of points over which the student's answer will be compared with the correct answer, and the method used to compare them.

Variable value generators

Give expressions which produce values for each of the variables in the expected answer. Leave blank to pick a random value from the range defined above, following the inferred type of the variable.

String restrictions

For each choice, specify the number of marks to add or subtract when the student picks it.

For each choice, write 1 if the student should tick it, or 0 if they should leave it unticked.

You must set a maximum number of marks in order to use this marking method.

You must set a maximum number of marks in order to use this marking method.

For each combination of answer and choice, specify the number of marks to add or subtract when the student picks it.

For each combination of answer and choice, write 1 if the student should tick it, or 0 if they should leave it unticked.

Both choices and answers must be defined for this part.

Help with this part type

Test that the marking algorithm works

Check that the marking algorithm works with different sets of variables and student answers using the interface below.

Create unit tests to save expected results and to document how the algorithm should work.

There's an error which means the marking algorithm can't run:

Question variables

These variables are available within the marking algorithm.

Name Value

Marking parameters

These values are available as extra variables in the marking algorithm.

Name Value

Part settings

These values are available as entries in the settings variable.

Name Value

Alternative used:

Note
Value Feedback

Click on a note's name to show or hide it. Only shown notes will be included when you create a unit test.

Unit tests

No unit tests have been defined. Enter an answer above, select one or more notes, and click the "Create a unit test" button.

The following tests check that the question is behaving as desired.

This test has not been run yet This test produces the expected output This test does not produce the expected output

This test is not currently producing the expected result. Fix the marking algorithm to produce the expected results detailed below or, if this test is out of date, update the test to accept the current values.

One or more notes in this test are no longer defined. If these notes are no longer needed, you should delete this test.

Name Value

 This note produces the expected output

This test has not yet been run.

When you need to change the way this part works beyond the available options, you can write JavaScript code to be executed at the times described below.

Run this script the built-in script.

This script runs after the built-in script.

To account for errors made by the student in earlier calculations, replace question variables with answers to earlier parts.

In order to create a variable replacement, you must define at least one variable and one other part.

The variable replacements you've chosen will cause the following variables to be regenerated each time the student submits an answer to this part:

These variables have some random elements, which means they're not guaranteed to have the same value each time the student submits an answer. You should define new variables to store the random elements, so that they remain the same each time this part is marked.

This part can't be reached by the student.

Add a "next part" reference to this part from another part.

None of the parts which can lead to this part are reachable either.

Next part options

Define the list of parts that the student can visit after this one.

• Variable replacements

No variable replacements have been defined for this next part option.
Variable Value

Previous parts

This part can follow on from:

This part doesn't follow on from any others.

Parts

Steps

Give a worked solution to the whole question.

Select extensions to use in this question.

Define rulesets for simplification and display of mathematical expressions.

Define functions to use in JME expressions.

• Parameters
• : of

Built-in constants

Tick the built-in constants you wish to include in this question.

Custom constants

You can define constants in terms of the built-in constants, even if they're disabled.
Names Value LaTeX

Add styling to the question's display and write a script to run when the question is created.

This script will run after the question's variable have been generated but before the HTML is attached.
Apply styling rules to the question's content.

This question is used in the following exams: