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JAMB 1997 · UME · Q10

A survey of 100 students in an institution shows that 80 students speak Hausa and 20 speak Igbo, while only 9 speak both languages. How many students speak neither Hausa nor Igbo?

Worked solution (try it first)
  1. At least one language: n(H∪I)=80+20−9=91n(H \cup I) = 80 + 20 - 9 = 91.
  2. Neither language: 100−91=9100 - 91 = 9, option B.

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