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GATE | GATE MOCK 2017 | Question 10

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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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Last Updated : 28 Jun, 2021
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