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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?


A

2/5

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B

3/5

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C

1/5

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D

4/5

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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)

=110 + 510

= 610

= 35


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