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From users who are members of Transition to university :
Christian LawsonPerfect  said  Ready to use  3 years, 7 months ago 
Bradley Bush  said  Needs to be tested  6 years, 11 months ago 
Hannah Aldous  said  Needs to be tested  6 years, 11 months ago 
Lauren Richards  said  Has some problems  6 years, 11 months ago 
Vicky Hall  said  Has some problems  6 years, 11 months ago 
From users who are not members of Transition to university :
Ashley Cusack  said  Has some problems  3 years, 7 months ago 
lucia ramsey  said  Ready to use  5 years, 1 month ago 
Deirdre Casey  said  Has some problems  6 years, 7 months ago 
History
Christian LawsonPerfect 3 years, 7 months ago
Saved a checkpoint:
I've fixed the advice for parts b and c  the power should be $n1$, not $n$.
Christian LawsonPerfect 3 years, 7 months ago
Gave some feedback: Ready to use
Ashley Cusack 3 years, 7 months ago
Gave some feedback: Has some problems
Ashley Cusack commented 3 years, 7 months ago
Advice for parts B and C is incorrect.
lucia ramsey 5 years, 1 month ago
Gave some feedback: Ready to use
Christian LawsonPerfect 6 years, 7 months ago
Gave some feedback: Ready to use
Christian LawsonPerfect 6 years, 7 months ago
Saved a checkpoint:
Looks like there was an offbyone error.
Deirdre Casey commented 6 years, 7 months ago
In part b does not accept correct answer. Mistake also shown in the solutions.
Deirdre Casey 6 years, 7 months ago
Gave some feedback: Has some problems
Christian LawsonPerfect 6 years, 10 months ago
Gave some feedback: Ready to use
Christian LawsonPerfect 6 years, 10 months ago
Saved a checkpoint:
Gave the variables sensible names and reworded some of the advice.
Elliott Fletcher 6 years, 10 months ago
Published this.Bradley Bush 6 years, 11 months ago
Gave some feedback: Needs to be tested
Bradley Bush commented 6 years, 11 months ago
Splitting into 3 questions with 3 parts each instead of 3 parts with 3 gaps
Christian LawsonPerfect commented 6 years, 11 months ago
And like the other sequences questions, the advice would benefit hugely from a table.
Christian LawsonPerfect 6 years, 11 months ago
Gave some feedback: Has some problems
Christian LawsonPerfect 6 years, 11 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 Aldous 6 years, 11 months ago
Gave some feedback: Needs to be tested
Lauren Richards commented 6 years, 11 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 Richards 6 years, 11 months ago
Gave some feedback: Has some problems
Hannah Aldous 6 years, 11 months ago
Gave some feedback: Needs to be tested
Vicky Hall commented 6 years, 11 months ago
It would also be helpful to give and exlain the formula for the $n$th term in the statement.
Vicky Hall 6 years, 11 months ago
Gave some feedback: Has some problems
Vicky Hall commented 6 years, 11 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 Aldous 6 years, 11 months ago
Gave some feedback: Needs to be tested
Hannah Aldous 6 years, 11 months ago
Created this.Name  Status  Author  Last Modified  

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 
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This question is used in the following exams:
 Sequences by Elliott Fletcher in Elliott's workspace.
 Geometric sequences by Christian LawsonPerfect in Transition to university.
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