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Question
Find the probability that a number selected at random from the numbers 1, 2, 3, ..., 35 is a multiple of 7.
Sum
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Solution
Total no. of possible outcomes = 35 {1, 2, 3, ..., 35}
E ⟶ event of getting no. which is multiple of 7
No. of favourable outcomes = 5 {7, 14, 21, 28, 35}
Probability, P(E) = `"No. of favorable outcomes"/"Total no. of possible outcomes"`
P(E) = `5/35`
= `1/7`
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