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 = $(8^{3} - 1) = (512 - 1) = 511$ .

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7, 26, 63, 124, 215, 342, ?

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