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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?A. 13B. 15C. 17D. 19 |
Answer» Correct Answer - B Let N = National savings certificates S = Shares Total no. of persons = 32 No. of persons who invest in National savings certificates = 30 No. of persons who invest in shares = 17 Therefore `n(NuuS)=32, n(N) =30, n(S)=17` We know that, `n(NuuS)=n(N)+n(S)-n(NnnS)` `implies32=30+17-n(NnnS)` `impliesn(NnnS)=47-32=15` |
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