there are 26 letters in the alphabet, so you multiply 26 by how many possibilities there are. that would be 26 x 2. you would then multiply that answer (52) by the possible number combinations. there are 10 numbers you could possibly have (0-10) and you choose one of these numbers 3 times. you would multiply 10 x 10 x 10 which equals 1000, then multiply that by your previous answer for the letters, 52. 1000 x 52 = 52000 possible combinations
