JAMB Mathematics 2008 Objective — Question 11
Question 11 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2008 Objective paper, with the correct answer and a full explanation.
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A bookseller sells Mathematics and English books. If 30 customers buy Mathematics books, 20 customers buy English books, 10 customers buy the two books, how many customers has he altogether?
- A. 30
- B. 40Correct
- C. 50
- D. 60
Explanation
n(M)=30, n(E)=20, n(M intersect E)=10. Total number of customers = n(M union E) = n(M)+n(E)-n(M intersect E) = 30+20-10 = 40.
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