Answer:
A is 1 in 100 and b is 1 in 25
Explanation:
there are 10 digits (1, 2, 3, 4, 5 ,6 ,7 ,8 ,9, 0).
that gives you a 1 in 10 chance but there are 2 and to get both of them, you do 1 in 10 x 1 in 10 which is 1 in 100. if you know that they are both even, this limits it to a 1 in 5 twice, 1 in 5 x 1 in 5 is 1 in 25.