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Q.

In a committee 50 people speak French, 20 speak Spanish and 10 speak both Spanish and French. The number of persons speaking at least one of these two languages is

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a

60

b

22

c

38

d

40

answer is A.

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Detailed Solution

$\begin{array}{l} n (A \cup B) = n (A) + n (B) - n (A \cap B) \\ = 50 + 20 - 10 \\ = 60 \end{array}$

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