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If S is a set with 10 elements and A={(x...

If S is a set with 10 elements and `A={(x,y):x,y in S, x ne y}`, then the number of elements in A is

A

100

B

90

C

80

D

150

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The correct Answer is:
B
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TARGET PUBLICATION-SETS, RELATIONS AND FUNCTIONS-COMPETITVE THINKING
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