Marisa C. answered 03/23/17
Tutor
5
(5)
Cornell PhD Candidate and Experienced Math/Economics Tutor
Let's say we wanted to figure out the probability of rolling either a 3 or a 4 on a 6-sided die. The probability of this is 2/6 - there are 2 sides we could roll (3 or 4) out of a total of 6 sides of the die.
The factors of 40 are 1, 2, 4, 5, 8, 10, 20. Four of these factors (1, 2, 4, and 5) are sides of a 6-sided die. Use the logic above to figure out what the probability is of rolling either a 1, 2, 4, or 5.