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The number that least fits this set: (324, 441, 97 and 64) is ________. (A) 324 (B) 441 (C) 97 (D) 64

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97 - all others are perfect squares while 97 is a prime number.

$18^2 = 324$

$21^2 = 441$

$8^2 = 64$
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