When A = {1, 2, 3, 4, 5} and r deined on A by xry if x + 1 = y, then r3 is
A. | {(1, 3) (2, 4)} |
B. | {(1, 3) (2, 5)} |
C. | {(1, 4) (2, 5)} |
D. | {(1, 4) (4, 5)} |
Option: C Explanation : Click on Discuss to view users comments. |
If A = {x I -1 < x < 1} = B, then function f(x) = x/2 from A to B is
A. | injective |
B. | surjective |
C. | both injective and surjective |
D. | neither injective nor surjective |
Option: A Explanation : Click on Discuss to view users comments. |
A ∪ B is NOT equivalent to
A. | |
B. | |
C. | |
D. | |
Option: D Explanation : Click on Discuss to view users comments. |
How many students know at least two languages?
A. | 135 |
B. | 30 |
C. | 10 |
D. | 45 |
Option: D Explanation : Click on Discuss to view users comments. |
Common Data for Q. 54-55.
Let A = {1, 2, 3, 4} and B = {0, 1, -1, 2} and several sets of ordered pairs be specified as :
I. {(1, 0), (2, 1), (3, -1), (4, 2)}
II. {(1, 0), (2, -1), (3, 2)}
III. {(4, 1), (3, 2), (2, 3), (1, 4)}
IV. {(2, 1), (3, 0), (1, - 1), (3, 1), (4, 2)}
V. {(2, 0), (1, -1), (3, 2) (4, 1)}
Which ofthe sets of ordered pairs are graphs of a function from A → B ?
Which of the sets of ordered pairs are graphs of a function from A → B ?
A. | II and III |
B. | III and IV |
C. | I and V |
D. | IV and V |
Option: C Explanation : Click on Discuss to view users comments. |