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Find the wrong number in the series: 8, 9, 20, 63, 256, 1265, 7716

Competition practiceNumber Series

A7716
B256
C1265
D63

Step-by-Step Solution

Pattern is

\times 1 + 1, \times 2 + 2, \times 3 + 3, \times 4 + 4, \times 5 + 5, \times 6 + 6.256 \times 5 + 5 = 1285

, not 1265. The next term

7716 = 1285 \times 6 + 6

confirms it.

Answer: C) 1265

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