If you roll a dice 100 times how many times would you expect to roll a product that is a multiple of 5

If you're rolling a single cube, then … — There are 6 possible out comes.- One of them (5) is a multiple of 5 .- The probability of rolling it is (1/6)=16-2/3% . If everything is acting perfectly random, then ion 100 rolls, you'd expect to succeed 16 or 17 times. If you're rolling a pair of cubes, then … — There are (6 x 6)=36 possible outcomes.- There are seven ways to get a multiple of 5. (1+4) , (4+1) , (2+3) , (3+2) , (4+6) , (6+4) , (5+5) — The probability of rolling one of those is (7/36)=19-4/9% . If everything is acting perfectly random, then in 100 rolls, you'd expect to succeed 19 or 20 times.