you choose at random from the letters a, b, c and d and you roll a number cube once. what are the chances that you get an a and 5?

1/24 or 4%

There is a total of 24 outcomes

4 letters • 6 numbers = 24 possible outcomes

There are 6 different outcomes when it comes to each letter.

(a1, a2, b1, b2 etc)

so getting a5 is a 1/24 chance because there 24 outcomes and only one of them is a5