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The sum of the product taken two at a ti...

The sum of the product taken two at a time of the numbers `1,2,2^2,2^3,.....2^(n-2),2^(n-1)` is

A

`1/3 . 2^(2n) +2/3`

B

`1/3. 2^(2n) -2^n + 1/3`

C

`1/3. 3^(2n) -1/3`

D

`1/3 . 2^(2n) -2^n + 2/3`

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The correct Answer is:
D
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