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The sequence \(a_1, a_2, a_3, a_4, a_5\) is such that \(a_n=a_{n-1}+5\) for \(2\le n\le 5.\) If \(a_5=31,\) what is the

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The sequence \(a_1, a_2, a_3, a_4, a_5\) is such that \(a_n=a_{n-1}+5\) for \(2\le n\le 5.\) If \(a_5=31,\) what is the

by Vincen » Fri Oct 16, 2020 12:11 am

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The sequence \(a_1, a_2, a_3, a_4, a_5\) is such that \(a_n=a_{n-1}+5\) for \(2\le n\le 5.\) If \(a_5=31,\) what is the value of \(a_1?\)

(A) 1
(B) 6
(C) 11
(D) 16
(E) 21

Answer: C

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