# Set Theory and Algebra MCQ - Sets

86:

The function f : N -->  N deined by f(n) = 2n + 3 is

 A. surjective B. not surjective C. injective D. none of these Answer Report Discuss Option: C Explanation : Click on Discuss to view users comments. Write your comments here:
87:

The number of distinct relations on a set of 3 elements is

 A. 8 B. 9 C. 18 D. 512 Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Write your comments here:
88:

If relation R over {a, b, c} is given by R = {(a, a), (a, b), (b, a), (b, b), (c, c)}, then which of the following properties does R have?

 A. Symmetry B. Reflexivity C. Transitivity D. All of these Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Write your comments here:
89:   Which of the following relations may be characterised as a function defined on the set I = {1, 2, 3, 4, 5} ?
 A. { (x, y) I x, y ∈ I, X < Y } B. { (x, y) I x, y ∈ 1, X > Y } C. { (x, y) I x, Y ∈  I, x = y/2} D. None of these Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Write your comments here:
90:   A - (B  C) is
 A. (A - B) ∪ (A - C) B. A - B - C C. (A - B) ∩ (A - C) D. A - (B ∩ C)' Answer Report Discuss Option: C Explanation : Click on Discuss to view users comments. Write your comments here: