If A - 5-6-7 and B-8-9 then the number of elements in A - B are -

Union of two sets has all the elements of both the sets. So, A ∪ B ={ 5,6,7, 8,9 } Thus the total number of elements in the above set is 5 ...

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Union of Sets

If A = 5,6,...

Question

If $A = {5, 6, 7}$ and $B = {8, 9}$ then the number of elements in $A \cup B$ are :

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A = {5, 6, 7}

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