Select the missing number in the given series? 18, 22, 21, 20, 24, 18, ?

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RRB NTPC Exam 27 Jan 2021 click here to view all questions

Select the missing number in the given series? 18, 22, 21, 20, 24, 18, ?

A25

B30

C27

D26

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correct answer is: option c (27) Explanation: The series follows an alternating pattern. Pattern 1: +3, -1, +3, -1.... starting from 18 Pattern 2: -2, -2, -2... starting from 22 The series becomes: 18 (+4) = 22, 22 (-1) = 21, 21 (-1) = 20, 20 (+4) = 24, 24 (-2) = 18, 18 (+9) = 2 Akhilesh ? answered Apr 1 '25 at 20:32

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