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Question

If A={x,y,z} then the relation R={(x,x),(y,y),(z,z),(z,x),(z,y)} is ____

A
symmetric
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B
transitive
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C
None of these
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D
Both A and B
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Solution

The correct option is B transitive

A relation R in A is said to be symmetric, if (a,b)R(b,a)R for a,bA.
Here (z,x)R. But (x,z)R. Hence the relation is not symmetric.

A relation R in A is said to be transitive, if (a,b)R and (b,c)R(a,c)R for all a,b,cA.

Here (z,x)R and (x,x)R(z,x)R.
Also (z,y)R and (y,y)R(z,y)R.

Hence relation is transitive.

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