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[" 10.The value of "(1)/(1+p+q^(-1))+(1)...

[" 10.The value of "(1)/(1+p+q^(-1))+(1)/(1+q+r^(-1))+(1)/(1+r+p^(-1))],[" given that "pqr=1" is: "],[[" (a) "1," (b) "0],[" (c) "pqr," (d) "p+q+r]]

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