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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

High School Mathematics
8.10 Important Points in Relations

1. A pair of elements a,b put in a particular order say (a,b) is called an ordered pair.

2. Cartesian product of sets:
If A and B are two sets A B = {(a,b)/a A, b B} and A B is read as A cross B.

3. In A B the first co-ordinate belongs to set A, while the second co-ordinate belongs to set B.

4. A B B A.

5. If n(A) = a and n(B) = b then n(A B) = ab, where n(A) is number of elements in A and read as the cardinal number of set A.

6. If A = {} and, B = {} then A B = {}.

7. If one of the sets A and B is empty then A B = {}.

8. The Cartesian product of two sets is represented by
a) Arrow diagram
b) Tree diagram
c) Graphical representation.


Directions: Choose the correct answer.
Q 1: If R is a relation then (R-|-| = ______.
R-|
R

Q 2: If A = {1,2} and B = {4,5} then A B = B A, correct it.
Not correct
Correct

Q 3: If A = {1,4,5} and B = {} then A B.
{}
None of these
{1,4,5]

Q 4: A relation is a set of ordered pairs.
Not correct
Correct

Q 5: If (a,b) = (5,6) then a = ______.
6
5

Q 6: "Is parallel to " is an equivalance relation.
Not correct
Correct

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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