Question 120
DIRECTION for the question: Find the wrong number in the series 1, 3, 10, 21, 64, 129, 356, 777
Solution
(1 x 2) + 1 = 3
(3 x 3) + 1 = 10
(10 x 2) + 1 = 21
(21 x 3) + 1 = 64
(64 x 2) + 1 = 129
(129 x 3) + 1 = 388
(388 x 2) + 1 = 777
Thus, the odd one out is 356
Hence, option E is the correct choice.
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