Question 1134573: An automobile license plate consists of 3 letters followed by 4 digits. How many different plates can be made:
a. If repetitions are allowed?
b. If repetitions are not allowed in the letters but are allowed in the digits?
c. If repetitions are allowed in the letters but not in the digits?
Answer by Glaviolette(140)   (Show Source):
You can put this solution on YOUR website! a. With repetition = 26*26*26*10*10*10*10 = 175,760,000
b. No repetition with letters (available letters decreases by 1 each time) = 26*25*24*10*10*10*10 = 156,000,000
c. No repetition with digits (available digits decrease by 1 each time) = 26*26*26*10*9*8*7 = 88,583,040
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