Subject :IMO Class : Class 8
When simplified, (x- 1 + y- 1)- 1 is equal to ____.
(A) x + y
(B) 
(C) x y
(D) 
i could not understand it. plz solve and inform by another method
Ans 1:
Class : Class 8
a) x+y
Ans 2:
Class : Class 8
((x^-1)+(y^-1))^-1=((1/x)+(1/y))^-1
=((x+y)/xy)^-1=xy/(x+y)