Question
Find the wrong number in the series given below.
7, 22, 68, 217, 625, 1880Solution
7 × 3 + 1 = 22. 22 × 3 + 2 = 68  68 × 3 + 3 = 207 but we have given 217 207 × 3 + 4 = 625 625 × 3 + 5 = 1880
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