Problem

13. If $n (A \cup B) = 50, n (A \cap B) = 10$ , and $n (B) = 20$ , find $n (A)$ .

Answer

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Answer

$n (A) = 50 - 20 + 10$

Steps

Step 1 ： $n (A \cup B) = n (A) + n (B) - n (A \cap B)$

Step 2 ： $50 = n (A) + 20 - 10$

Step 3 ： $n (A) = 50 - 20 + 10$

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