probability
posted by Anonymous .
If you pick a number completely at random from the natural numbers between 1 and 42, find the probability that the number is a multiple of 3.

lets see: 3,6,9,12,15,looks like every third number. So 2/3 of them are not multilples, 1/3 is
Pr= 1/3 
the prob. will be 1/3.