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Question

In a city 20 percent of the population travels by car, 50 percent travels by bus and 10 percent travels by both car and bus. Then the percentage of population travelling by car or bus is


  1. 80 percent

  2. 40 percent

  3. 70 percent

  4. 60 percent


Solution

The correct option is D

60 percent


n(C) = 20, n(B) = 50, n(C ∩ B) = 10

Now n(C ∪ B) = n(C) + n(B) - n(C ∩ B)

                       = 20 + 50 - 10 = 60.

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