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What should follow 172 in the series 2, 3, 10, 39, 172, ?

Competition practiceNumber Series

A885
B880
C875
D890

Step-by-Step Solution

Rule:

\times 1 + 1^{2}, \times 2 + 2^{2}, \times 3 + 3^{2}, \times 4 + 4^{2}

. 2→3→10→39→172, then

172 \times 5 + 25 = 885

.

Answer: A) 885

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