X and Y are two sets and f:X→ Y .If f(c)={y; c is subset ofX , y is subset of Y} and f^-1(d) = {x;d is subset of Y,x is subset of X}, then the true statement is

A) f(f^-1(b)) = b

B) f(f^-1(b)) = b,b is subset of Y

C) f^-1(f(a)) = a

D) f^-1(f(a)) = a,a is subset of X

raman malik , 16 Years ago

Grade 12