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OpenStudy (anonymous):
When using induction to prove that the sum of the first n multiples of 4 (4 + 8 + 12 + … + an, where an = 4n) is 2n2 + 2n, which expression represents Sk? Sk = k2 + k Sk = 2k2 + k Sk = 2 × (1)2 + 2 × 1 Sk = 2k2 + 2k
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OpenStudy (anonymous):
the one that looks like \( 2n^2 + 2n\) only with \(k\) instead of \(n\)
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