Adie contains the numbers 1 through 6.
david rolls the die 2 times. what is the probability of getting a 3 on the first roll and a 5 on the second roll?

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

take it another