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At what values of parameter a are there ...

At what values of parameter `a` are there values of `x` such that the numbers: `(5^(1+x)+5^(1-x)),a/2,(25^x+25^-x)` form an`A.P.` ?

A

`a lt 12`

B

`a le 12`

C

`a ge 12`

D

None of these

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The correct Answer is:
D
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