Directions: Find out the wrong number in the following number series.
Q. 20, 57, 118, 209, 336, 508
A.336
B.118
C.209
D.508
E.57
Sol:
33 – 7 = 20
43 – 7 = 57
53 – 7 = 118
63 – 7 = 209
73 – 7 = 336
83 – 7 = 505
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