Question
Find the wrong number in the given number series.
7, 15, 31, 57, 87, 127Solution
Check differences: 15 − 7 = 8 31 − 15 = 16 57 − 31 = 26 87 − 57 = 30 127 − 87 = 40 The intended pattern seems: +8, +16, +24, +32, +40 (each increase by 8). Correct series should be: 7 7 + 8 = 15 15 + 16 = 31 31 + 24 = 55 (not 57) 55 + 32 = 87 87 + 40 = 127 So 57 is incorrect.
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