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GATE | GATE MOCK 2017 | Question 10

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  • Last Updated : 28 Jun, 2021

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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