Sunday, 28 December 2014

Puzzle #54 - Find the odd man out

Among the following perfect squares which is the odd man out and why

121, 144, 169, 196, 225, 256, 289, 324

2 comments:

  1. 121
    1. It is the only perfect square that is divisible only by it's square root (and 1 ofcourse)
    2. On a lighter note, it's the only palindrome in the series

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  2. 196. The reverse 691 is a prime.

    ReplyDelete