Question
Odd man out: 1, 3, 10, 21, 64, 129, 256, 778
Answer: Option D
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The sequence is *2 + 1, *3 + 1, *2 + 1, *3 + 1,......So, 256 is wrong and must be replaced by (129 * 2 + 1 ) i.e. 259.
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