Answer
$15$ balls
Work Step by Step
The "balls per layer" formula gives
$a_{5}=\displaystyle \frac{5(5+1)}{2}=15$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 12 Sequences and Series - 12.1 Define and Use Sequences and Series - 12.1 Exercises - Problem Solving - Page 800: 67a
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