SOLUTION: What is the probability of getting a license plate that has a repeated letter or digit if you live in a state in which license plates have four letters followed by two numerals?
The condition allows 26 English letters with repetitions in 4 positions, and 10 digits with repetitions in 2 positions.
The total number of such licence plates is = 45,697,600.
The probability of getting any one such a plate is, therefore, .