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What should come in place of question mark (?) in the given number series ?4 9 20 43 84 ?
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By: anil on 05 May 2019 01.35 am
Let the missing number be x 9 - 4 = 5 20 - 9 = 11 43 - 20 = 23 84 -43 = 41 Let say that (x - 84 = y) Now check the difference between the differences we got from consecutive numbers. 11 - 5 = 6 23 - 11 = 12 41 - 23 = 18 So y - 41 = 24 y = 65 x = 65 + 84 = 149
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