Question
In each of the following number series, one term is
wrong. Find the WRONG term. 6, 9, 15, 27, 53, 99, 195Solution
Differences: 9 − 6 = 3 15 − 9 = 6 27 − 15 = 12 53 − 27 = 26 99 − 53 = 46 195 − 99 = 96 Try doubling differences: 3, 6, 12, 24, 48, 96 Apply: 6 + 3 = 9 9 + 6 = 15 15 + 12 = 27 27 + 24 = 51 (should be 51, not 53) 51 + 48 = 99 99 + 96 = 195 So 53 is incorrect. Wrong term = 53
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