What should come in place of question mark (?) in the following number series ?
6, 26, 134, 666, 3334, 16666, ?
Here, the nth term is obtained by 'previous term' *5+ (-1)^(n-1) *4.
Hence, 7th term will be obtained by 16666*5 + (-1)^6 * 4 = 83334
Therefore, the correct option is option D.
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