Four of the following five are alike in a certain way and
hence form a group. Which one of the following does not
belong to that group?
(a) 21
(b) 35
(c) 49
(d) 63
(e) 56
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e. 56 is 7*8 which is the product of 7 with even no.
56 is rigt answer because here
21=7*3,35=7*5,49=7*7,63=7*9,56=7*8 56 is multiply 7 or even
no fo 8