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if E=1/4. 2/6. 3/8. 4/10.............30/...

if `E=1/4. 2/6. 3/8. 4/10.............30/62. 31/64=8^x` then the value of `x` is

A

`-7`

B

`-9`

C

`-10`

D

`-12`

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The correct Answer is:
D
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