1.

The maximum number of equivalence relations on the set A = {1, 2, 3} areA. 1B. 2C. 3D. 5

Answer» Correct Answer - D
Given that, A = {1, 2, 3}
Now, number of equivalence relations as follows
`R_(1)={(1,1),(2,2),(3,3)}`
`R_(2)={(1,1),(2,2),(3,3),(1,2),(2,1)}`
`R_(3)={(1,1),(2,2),(3,3),(1,3),(3,1)}`
`R_(4)={(1,1),(2,2),(3,3),(2,3),(3,2)}`
`R_(5)={(1,2,3) hArr A xx A= A^(2)}`
` :. ` Maximum number of equivalence relation on the set A = {1, 2, 3} = 5


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