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Question
If n(A) = 7, n(B) = 13, n(A ∩ B) = 4, then n(A ∪ B) =?
Sum
Solution
We have,
n(A) = 7, n(B) = 13 and n(A ∩ B) = 4
Since, n(A ∪ B) = n(A) + n(B) - n(A ∩ B)
= 7 + 13 - 4
∴ n(A ∪ B) = 16
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Number of Elements in a Set
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