Choose the missing number in the series:
9, 7, 12, 12, 15, 17, 18, 22, ?
(A) 27
(B) 21
(C) 22
(D) 24
Answer: (B)
Explanation:
There are two series present in this above pattern at alternate positions.
9, 12, 15, 18, ? (common difference is 3) , hence next number will be 21
7, 12, 17, 22 ( common difference is 5)
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