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Q8 of 109 Page 1

If A = {2, 3, 4}, B = {1, 3, 7} and R = {(x,y) : x ϵ A, y ϵB and x < y} is a relation from A to B, then write R–1.

Given A = {2, 3, 4}, B = {1, 3, 7} and R = {(x,y) : x ϵ A, y ϵB and x < y}


According to the condition x < y


⇒ R= A × B


⇒ R={(2,3), (2,7), (3,7), (4,7)}


⇒ R-1= B × A


⇒ R-1={ (3,2), (7,2), (7,3), (7,4)}


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6

If R is a symmetric relation on a set A, then write a relation between R and R–1.

7

Let R = {(x,y): |x2 – y2| < 1} be a relation on set A = {1, 2, 3, 4, 5}. Write R as a set of ordered pairs.

9

Let A = {3, 5, 7}, B = {2, 6, 10} and R be a relation from A to B defined by R = {(x, y) : x and y are relatively prime}. Then, write R and R–1.

10

Define a reflexive relation.

Questions · 109
1. Relations
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