A warranty identification number for a certain product consists of a letter of the alphabet followed by a seven-digit number. How many possible identification numbers are there if the first digit of the seven-digit number must be nonzero?
Permutation. you have 26 options for the slot 1, 9 options for slot 2, and 10 options for the last 6 slots. Therefore you just multiply each slot together 26•9•10•10•10•10•10•10 =234000000
