Question

If (a+b+c+d) = 4, then:
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)=???​

Answer 1

Answer:

0

Step-by-step explanation:

=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)

=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)

=4-4/(1-a)(1-b)(1-c)(1-d)

=0