Answer:
17,576,000 license plates
Step-by-step explanation:
There are 26 letters in the English Alphabet while there are 10 single digits (0,1,2,3,4,5,6,7,8,9) that can be used.
Since you need to fill up the configuration with 3 letters and 3 digits, this is how it must be done
For 3 letters: 26 x 26 x 26 = 17576
For 3 digits: 10 x 10 x 10 = 1000
17576 x 1000 = 17,576,000