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1, 2, 6, 22, 88, 445: which term breaks the pattern?

Competition practiceNumber Series

A88
B6
C22
D445

Step-by-Step Solution

Rule:

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

gives 1, 2, 6, 21, 88, 445. So 22 should be 21.

Answer: C) 22

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