A number of 4 different digits is formed by using 1, 2, 3, 4, 5, 6, 7. Find
the probability that it is divisible by 5.
Digits can be repeated
It must end in a 5
number of cases = 7x7x7x1 = 343
the probability that it is divisible by 5.
Digits can be repeated
number of cases = 7x7x7x1 = 343