How to write subsets A={1,2,3,4,5} B={,7,8,9,3,2}
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Number of elements in A=10
Number of subsets of A containing exactly two elements
= Number of ways we can select 2 elements from 10 elements
10C2=210×9=45
∴ Number of subsets of A containing exactly two elements =45
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Answer:
A is containg 2 elements=45
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