engineering recuitment ISRO Scientist Computer Science Mock Test Engineering Mathematics Set Theory & Algebra Relations
Let A = {1, 2, 3, 4} and B = {a, b, c, d} . The function f and g are given by
f = {(1, a), (2, a), (3, c), (4, d)}
g = {(1, a), (2, c), (3, b), (4, d)}
Which of the following is true?
1
f-1 exists but g-1 does not exist
2
f-1 does not exist but g-1 exist
3
both f-1 and g-1 exist
4
neither f-1 nor g-1 exist