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What will come in place of the question mark in the series below? 7, 4.5, 5.5, 12, 49, ?

393
396
354
367

Correct Answer: 393

Explanation:

Ans.
4.5 = 7 x 0.5 + 1
5.5 = 4.5 x 1 + 1
12 = 5.5 x 2 + 1
49 = 12 x 4 + 1
? = 49 x 8 + 1, i.e. ? = 393

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