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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