What is the probabilty that a random license plate with 2 nu

What is the probabilty that a random license plate with 2 numbers from 0-9 and 4 uppercase letters contain the letter A? |S| is (10^2)(26^4) but I am not sure how to get |E|

Solution

you have 2 numbers and 4 letters

in total we have 10*10 * 26*26*26*26 = 45697600

and that contain the letter A will be

10*10*1*25*25*25 = 1562500

probability is 1562500 / 45697600 = 0.03419