Question
Find the missing term: 3, 7, 15, 31, 63, ?
Solution
Observe pattern in differences: 7 − 3 = 4 15 − 7 = 8 31 − 15 = 16 63 − 31 = 32 Differences are 4, 8, 16, 32 (powers of 2, doubling each time). Next difference = 64 So missing term = 63 + 64 = 127.
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