Question 955317
prime digits between 0 and 9 are:


2, 3, 5, 7


that's 4 out of 10.


probability of a digit being a prime is therefore equal to 4/10


the probability of all 3 digits being prime if the digits can be repeated is therefore equal to 4/10 * 4/10 * 4/10 which is equal to 64 / 1000.


if the digits can't be repeated, then the probability is 4/10 * 3/9 * 2/8 which is equal to 24 / 720.