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Find the WRONG number in the series: 6, 7, 16, 51, 206, 1045, 6276

Competition practiceNumber Series

A206
B16
C51
D1045

Step-by-Step Solution

Pattern is

\times 1 + 1, \times 2 + 2, \times 3 + 3, \times 4 + 4, \times 5 + 5, \times 6 + 6

. So

51 \times 4 + 4 = 208

, not 206; the rest

(208 \times 5 + 5 = 1045, 1045 \times 6 + 6 = 6276)

fit. Wrong number is 206.

Answer: A) 206

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