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If a+b+c+d=4 then the value of (1)/((1-a...

If `a+b+c+d=4` then the value of `(1)/((1-a)(1-b)(1-c))+(1)/((1-b)(1-c)(1-d))+(1)/((1-c)(1-d)(1-a))+(1)/((1-d)(1-a)(1-b))` is

A

0

B

1

C

4

D

`1+" abcd"`

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