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Question

Let for two sets A and B, A×B={(1,3),(2,3),(3,4),(2,5),(5,7),(1,6)}, and a relation R is defined from A to B, then the correct options is/are

A
R1={(x,y):x,yN,x>y,x+y=7
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B
Domain of R can be {1,2,3,5}
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C
Range of R can be {3,5,7}
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D
Co domain of R is {3,4,5,6,7}
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Solution

The correct options are
A R1={(x,y):x,yN,x>y,x+y=7
B Domain of R can be {1,2,3,5}
C Range of R can be {3,5,7}
D Co domain of R is {3,4,5,6,7}
If x,yN,x>y,x+y=7
x=6,y=1(x,y)=(6,1)
x=5,y=2(x,y)=(5,2)
x=4,y=3(x,y)=(4,3)
Here, B×A={(3,1),(3,2),(4,3),(5,2),(7,5),(6,1)}
and R1B×A

Domain can be the first element of ordered pair from A×B
Domain of R can be {1,2,3,5}

Range can be the second element of ordered pair from A×B
Range of R can be {3,5,7}

Co domain is set of all the second elements of ordered pair from A×B
Co domain of R is {3,4,5,6,7}


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