12 15 17 21 26 32 39 ........

Quantitative Aptitude (SBI-CL) Number series

Find the wrong term in given number series.

12, 15, 17, 21, 26, 32, 39

The pattern of the given series is:
12 + 2 = 14
14 + 3 = 17
17 + 4 = 21
21 + 5 = 26
26 + 6 = 32
32 + 7 = 39

So 15 is the wrong term.

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