<p>If one of the positive factors of 40 is to be chosen at random what is the probability that the chosen factor will not be a multiple of 10?</p>
<p>My answer was 5/7, but the answer is 5/8? Can anyone explain?</p>
<p>all positive factors of 40</p>
<p>1 40
2 20
4 10
5 8</p>
<p>8 multiples, 3 are multiples of 10 8-3 = 5.</p>
<p>lol, i realize that i forgot to take 40 into account, what a dumbass mistake. lol so yeah then it would be 5/8</p>