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2, 7, 27, 107, 427,?

Correct Answer: 1707

Explanation:

The pattern is + 5, + 20, + 80, + 320, ...... i.e. + (5 x 12), + (5 x 22), + (5 x 42), + (5 x 82),.....


So, missing term = 427 + (5 x 162) = 427 + 1280 = 1707.


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