There exists a positive number k such th...

There exists a positive number k such that ` log_2x+ log_4x+ log_8x= log_kx`, for all positive real no x. If k=`a^(1/b)` where (a,b) `epsilon` N, the smallest possible value of (a+b)= (c)

A

12

B

63

C

65

D

75

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The correct Answer is:

D

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