If x epsilon R, the numbers 2^(1+x)+2^(...

If `x epsilon R`, the numbers `2^(1+x)+2^(1-x), (b)/(2), 36^(x)+36^(-x)` from an `A.P`, then `b` must line in the interval

A

`[12,oo)`

B

`[6,oo)`

C

`(-oo,6)`

D

`[6,12]`

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The correct Answer is:

A

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