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If 5^(1+x) + 5^(1-x) , ( a)/(2), 25^(x) ...

If `5^(1+x) + 5^(1-x) , ( a)/(2), 25^(x) + 25^(-x)` are in A.P., then the set of values of a for such an A.P. to exists is `:`

A

`( 6,oo)`

B

`[12,oo)`

C

`(18,oo)`

D

`(-12,oo)`

Text Solution

Verified by Experts

The correct Answer is:
B
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