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

If a, b and c are all different from zero and Delta = |(1 +a,1,1),(1,1 +b,1),(1,1,1 +c)| = 0 , then the value of (1)/(a) + (1)/(b) + (1)/(c) is

If a, b and c are all different from zero and Delta = |(1 +a,1,1),(1,1 +b,1),(1,1,1 +c)| = 0 , then the value of (1)/(a) + (1)/(b) + (1)/(c) is

If a + 1/b = b + 1/c = 1, then the value of c + 1/a is

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