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If three positive real numbers `,b ,c` are in A.P. sich that `a b c=4` , then the minimum value of `b` is `2^(1//3)` b. `2^(2//3)` c. `2^(1//2)` d. `2^(3//23)`

A

`2^(3//2)`

B

`2^(2//3)`

C

`2^(1//3)`

D

`2^(5//2)`

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The correct Answer is:
B
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