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Sequence

2, 7, 27, 107...

Question

2, 7, 27, 107, 427, ?

1262

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1707

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4027

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4207

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Solution

The correct option is A 1707
The pattern is + 5, + 20, + 80, + 320, ...... i.e. + $(5 \times 1^{2}), + (5 \times 2^{2}), + (5 \times 4^{2}), + (5 \times 8^{2}), . . . . .$
So, missing term = $427 + (5 \times 16^{2}) = 427 + 1280 = 1707$ .

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