please help ............
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Take L. C. M
(1-d)+(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)
=0
(1-d)+(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)
=0
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