Find the missing term in the following series.
$4, 8, 28, 80, 244, ?$

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 D $728$
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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