Sets-Relations-And-Functions Question 150
Question: Out of 32 persons, 30 invest in national savings certificates and 17 invest in shares. What is the number of persons who invest in both?
Options:
A) 13
B) 15
C) 17
D) 19
Correct Answer: B $ \Rightarrow 32=30+17-n(N\cup S) $ $ \Rightarrow n(N\cap S)=47-32=15 $
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Answer:
Solution:
We know that,
$ n(N\cup S)=n(N)+n(S)-n(N\cap S) $
BETA
