a. The probability is 1/100 since there are 10 possible digits (0-9) and you need the last two digits so
.
This is 1%.
b. Let's start by calculating the probability of getting the right digits knowing that they are both even.
We have a total of 5 even digits (0, 2, 4, 6, 8). You need the last two so
which is 4%.
Therefore the answer is a) It increases the probability that your choice is correct to 1/25, or 4%, because each digit could be 0, 2, 4, 6 or 8.