Find the missing numbers:
$16, 33, 65, 131, (?), 523$

261

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521

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613

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721

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Solution

The correct option is A $261$
Given series is $16, 33, 65, 131, (?), 523$
Here, we have
$33 = 16 \times 2 + 1$
$65 = 33 \times 2 - 1$
$131 = 65 \times 2 + 1$
Let the missing number be y
Clearly, $y = 131 \times 2 - 1 = 262 - 1 = 261$
Hence, option (A) is the correct answer.

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