1.

`1/(1+a)+1/(1-b)+1/(1-c)` का मान ज्ञात करें?A. 1B. 2C. 3D. 4

Answer» Correct Answer - D
`a/(1-a)+b/(1-b)+c/(1-c)=1`
Add 3 both sides
`implies1/(1-a)+b/(1-b)+c/(1-c)+3=1+3`
`implies(a/(1-a)+1)+(b/(1-b)+1)+(c/(1-c)+1)=4`
`implies((a+1-a)/(1-a))+((b+1-b)/(1-b))`
`+((c+1-c)/(1-c))=4`
`implies 1/(1-a)+1/(a-b)+1/(1-c)=4`


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