Identify the term that will replace the ?
$4, 8, 28, 80, 244, ?$

278

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428

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628

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728

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Solution

The correct option is B $728$
The terms of the given series are : $3^{1} + 1$ , $3^{2} - 1$ , $3^{3} + 1$ , $3^{4} - 1$ , $3^{5} + 1$ , .
So missing term $3^{6} - 1 = 729 - 1 = 728$
Hence, the answer is (D).

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