What number will replace the ?
$3, 15, ?, 63, 99, 143$

27

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35

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45

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56

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Solution

The correct option is B $35$
The terms of the given series are $(2^{2} - 1)$ , $(4^{2} - 1)$ , ......., $(8^{2} - 1)$ , $(10^{2} - 1)$ , $(12^{2} - 1)$ .
So, missing term $= (6^{2} - 1) = (36 - 1) = 35$
Hence, option B is the correct answer.

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