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.