5, 13, 29, 61, 120, 253
Answer : Option A
Explanation : 5 + 8 = 13 13 + 16 = 29 29 + 32 = 61 
125 + 128 = 253
Therefore, the number 120 is wrong in the series.
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5, 13, 29, 61, 120, 253
125 + 128 = 253
Therefore, the number 120 is wrong in the series.