Posted by **Urgen please help** on Sunday, May 27, 2012 at 11:44pm.

Choose a natural number between 1 and 30, inclusive. What is the probability that the number is a multiple of 3?

- ALGEBRA -
**Reiny**, Sunday, May 27, 2012 at 11:47pm
multiples of 3 are

3 6 9 12 15 18 21 24 27 and 30

that is, there are 10 of them

so prob = 10/30 = 1/3

(makes sense, just like the prob that picking a number from 1 to 40, which is a multiple of 4 would be 1/4)

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