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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?

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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) 13 

(b) 15 

(c) 17 

(d) 19

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1 Answer

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(b) 15

Use n (A ∪ B) = n (A) + n (B) – n (A ∩ B)

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