Directions : Find the odd word/number/number-pair from the given alternatives.
The pattern is that the sum of digits of the numbers is a perfect square.
10 => 1 + 0 = 1
13 => 1 + 3 = 4
234 => 2 + 3 + 4 = 9
681 => 6 + 8 + 1 = 15
997 => 9 + 9 + 7 = 25
=> Ans - (D)
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