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What number comes next in 7, 26, 63, 124, 215, ?

Competition practiceNumber Series

A342
B343
C341
D336

Step-by-Step Solution

The terms are

n^{3} - 1

for

n = 2

, 3, 4, 5, 6: 8 − 1, 27 − 1, 64 − 1, 125 − 1, 216 − 1. Next:

7^{3} - 1 = 342

.

Answer: A) 342

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