Question 7

The odd term out in the series 15, 16, 34, 105, 424, 2124, 12756 is

Solution

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The first term = 15
Second = (15x1) + 1 = 16
Third = (16x2) + 2 = 34
Fourth = (34x3) + 3 = 105
Fifth = (105x4) + 4 = 424
Sixth = (424x5) + 5 = 2125
Seventh = (2125x6) + 6 = 12756
 
Hence, the order of sequence = {15, 16, 34, 105, 424, 2125, 12756}

Therefore the odd term is 2124.

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