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Find the sum of n terms of the sequence ...

Find the sum of `n` terms of the sequence `(x+1/x)^2,(x^2+1/(x^2))^2,(x^3+1/(x^3))^2, `

A

`((x^(20)-1)/(x^(2)-1))((x^(22)+1)/(x^(20)))+20`

B

`((x^(18)-1)/(x^(2)-1))((x^(11)+1)/(x^(9)))+20`

C

`((x^(18)-1)/(x^(2)-1))((x^(11)-1)/(x^(9)))+20`

D

none of these

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The correct Answer is:
A
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OBJECTIVE RD SHARMA ENGLISH-SEQUENCES AND SERIES-Exercise
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