1.

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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