Question
Find the wrong number in the series. 2, 3, 7, 15,
31, 63, 127Solution
ATQ,
Each term: Previous term × 2 + 1
2 × 2 + 1 = 5 (but given is 3 incorrect)
Correct series:
2, 5, 11, 23, 47, 95, 191
(×2 + 1 pattern)
3 is wrong, should be 5
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