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A survey of 100 students in an institution show... - JAMB Mathematics 1997 Question

A survey of 100 students in an institution shows that 80 students speak Hausa and 20 students speak Igbo, while only 9 students speak both language. How many students speak neither Hausa nor Igbo?
A
orange
B
9
C
11
D
20
correct option: b
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