Bunuel wrote:
How many license plates are possible if the plate must contain exactly five digits, and the plate cannot start with 0 or repeat any digits? (The digits must be in a row and the plate contains no other characters.)
A. 8,238
B. 15,120
C. 27,216
D. 30,240
E. 59,049
Since we can’t use 9 as the first digit, we have 9 choices for the first digit. Since we can’t repeat the digits, we have 9 choices for the second digit, 8 for the third, 7 for the fourth, and 6 for the fifth.
Thus, there are 9 x
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