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In the set X = { a, b, c, d} which of t...

In the set `X = { a, b, c, d}` which of the following relation is a function?

A

`R_{1} = {(b, a), (a, b), (c, d), (a, c)}`

B

`R_{2} = {(a, d), (d, c), (b, b), (c,c)}`

C

`R_{3} = {(a, b), (b, c), (c, d), (b, d)}`

D

`R_{4} = {(a, a),(b,b),(c, c), (a,d)}`

Text Solution

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The correct Answer is:
B
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