What number will replace the ?
$7, 26, 63, 124, 215, 342, ?$

391

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421

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481

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511

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Solution

The correct option is D $511$
The terms of the given series are $(2^{3} - 1)$ , $(3^{3} - 1)$ , $(4^{3} - 1)$ , $(5^{3} - 1)$ , $(6^{3} - 1)$ , $(7^{3} - 1)$ , ......
So, missing term $= (8^{3} - 1) = (512 - 1) = 511$
Hence,option D is the correct answer.

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