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Prove that 1/(1+p+q^(- 1))+1/(1+q+r^(- 1...

Prove that `1/(1+p+q^(- 1))+1/(1+q+r^(- 1))+1/(1+r+p^(- 1))=1,if pqr=1` .

A

1

B

pq

C

qr

D

`(1)/(pq)`

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The correct Answer is:
A
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