Question
Find the wrong term  in the following series:
3, 7, 15, 31, 63, 125, 255Solution
Check the pattern term by term: 3 → 7: 3×2 + 1 = 7 7 → 15: 7×2 + 1 = 15 15 → 31: 15×2 + 1 = 31 31 → 63: 31×2 + 1 = 63 63 → 127: 63×2 + 1 = 127 (this is what it should be) 127 → 255: 127×2 + 1 = 255 (fits the pattern if previous term is 127) So the correct series should be: 3, 7, 15, 31, 63, 127, 255 Given term 125 breaks the rule. Wrong term = 125.
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