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

If `x in R ,` the numbers `2^(1+x)+2^(1-x), b//2,36^x+36^(-x)` form an A.P., then `b` may lie in the interval `[12 ,oo)` b. `[6,oo)` c. `(-oo,6]` d. `[6, 12]`

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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