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प्रश्न
In a city 20% of the population travels by car, 50% travels by bus and 10% travels by both car and bus. Then, persons travelling by car or bus is
पर्याय
(a) 80%
(b) 40%
(c) 60%
(d) 70%
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उत्तर
(c) 60%
Suppose C and B represents the population travel by car and Bus respectively.
\[n\left( C \cup B \right) = n\left( C \right) + n\left( B \right) - n\left( B \cap C \right)\]
\[ = 0 . 20 + 0 . 50 - 0 . 10\]
\[ = 0 . 6 \text{ or } 60 %\]
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