Question

A positive 3 digit number has its units digit zero. find the probability that the number is divisible by 4.

Answer 1

total number of 3 digit number end with 0 = 90
total number of 3 digit number end with 0 that are divisible by 4 = 45
probability of getting 3 digit number end with 0 that are divisible by 4 = $\frac{45}{90}$
                                                                                                                     = 1/2