Short Answer Type
(e) (B - C)'
In a group of 400 people, 250 can speak Hindi and 200 can speak English. How many people can speak both Hindi and English?
In a committee, 50 people speak French, 20 speak Spanish and 10 speak both Spanish and French. How many speak at least one of these two languages?
Let A = set of people who can speak French.
n(A) = 50
....(i)
B = set of people who speak Spanish
n(B) = 20 ....(ii)
Number of people who speak both languages = 
....(iii)
Number of people who speak at least one of the two languages 
....(iv)
We know that 
∴ 
Hence, the number of people who speak at least one of the two languages
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