AIR MATH

Math Question

Jonah stacks balls of yarn in a square pyramid for a store display. The number of balls of yarn, \( P(n) \), in \( n \) layers of the square pyramid is given by \( P(n)=P(n-1)+n^{2} . \)
Which could not be the number of balls of yarn Jonah stacks?
A. 5
B. 14
C. 24
D. 30

Solution

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