You ask a friend to think of a number from 5 to 40. What is the probability that his number will be multiple of 10?

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Solution

There are a total of 36 outcomes, of which 4 are favourable: 10, 20, 30 and 40.
Hence, the required probability will be $\frac{4}{36}$ = $\frac{1}{9}$ .

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You ask a friend to think of a number from 5 to 40. What is the probability that his number will be multiple of 10?

There are a total of 36 outcomes, of which 4 are favourable: 10, 20, 30 and 40. Hence, the required probability will be 436 = 19.

There are a total of 36 outcomes, of which 4 are favourable: 10, 20, 30 and 40.
Hence, the required probability will be $\frac{4}{36}$ = $\frac{1}{9}$ .