Find the number that doesn't belong to the following series:
$36, 49, 100, 144, 196, 256, 324$

100

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49

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256

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144

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Solution

The correct option is B $49$
Series is $6^{2}, 8^{2}, 10^{2}, 12^{2} . . . . . .$ , the squares of even numbers.
$49 = 7^{2}$ which does not belong to the series.
Hence, option $B$ is the correct answer.

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