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Question

A number from 1 to 10 is chosen at random. What is the probability of choosing  5 or an even number?


  1. 2/5

  2. 3/5

  3. 1/5

  4. 4/5


Solution

The correct option is B

3/5


The sample space is S = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

n(S) = 10

P(5) = 110

P(even number) = 510

P(5 and an even number) = 0

P(5 or an even number) = P(5) + P(even number)

                                        =110510

                                        = 610

                                         =  35

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