1.

यदि `a+b+c+d=4` हो तो `1/((1-a)(1-b)(1-c))+1/((a-d)(1-a)(1-b))` का मान बताइए?

Answer» Correct Answer - A
`1/((1-a)(1-b)(1-c))+1/((1-b)(1-c)(1-d))`
`1/((1-a)(1-a)(1-b))`
`=(1-a+1-a+1-b+1-c)/((1-a)(1-b)(1-c)(1-d))`
`(4-(a+b+c+d))/((1-a)(1-b)(1-c)(1-d))`
`(4-4)/((1-a)(1-b)(1-c)(1-d))=0`


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