Mathematics
If A = {3, 5, 7} and B = {5, 7, 9}, then n(A ∩ B) is :
6
2
4
none of these
Sets
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Answer
A = {3, 5, 7}
B = {5, 7, 9}
A ∩ B - contains all the common elements in set A and B.
A ∩ B = {3, 5, 7} ∩ {5, 7, 9}
A ∩ B = {5, 7}
n(A ∩ B) = 2
Hence, option 2 is the correct option.
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