Directions : In each of the following questions, four/five options are given. Out of these, three/four are alike in a particular way but remaining one is different. Find the odd one from the given options which is different from others.
Find the odd number from the below-given options.
Options:
A . 21
B . 55
C . 63
D . 49
Answer: Option D Answer: (d) This is the only complete square in the group.
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