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Consider the following sequence:

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\$\\var{a}, \\var{a+d}, \\var{a+2*d}, \\var{a+3d}, \\var{a+4d}, \\var{a+5d}, \\ldots\$

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Is this sequence:

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Given the following recurrence relation for this sequence, find A and B:

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\$C(n)=\\begin{cases} A & if & n=1\\\\ C(n-1) + B & if & n\\geq2 \\end{cases}\$

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A = [[0]] and B = [[1]]

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What is the sum of the first $\\var{n}$ terms of the sequence? [[0]]

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