Direction: Find out the wrong number in the following number series.
Q. 3, 7, 13, 20, 31
A.3
B.7
C.13
D.20
E.21
Sol:
12 + 2 = 3
22 + 3 = 7
32 + 4 = 13
42 + 5 = 21
52 + 6 = 31
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