Answer
b)
Work Step by Step
By Gauss' Rule, the answer is b), the sum of the first $n$ positive integers is: $\frac{n(n+1)}{2}$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 12 - Sequences; Induction; the Binomial Theorem - 12.1 Sequences - 12.1 Assess Your Understanding - Page 807: 8
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