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A key code must contain 4 letters and 3 numbers. The letters may be any letter of the alphabet. The numbers should be any number from 0 to 9. How many different key code combinations are there?
A. 456,976,000
B. 292,484,000
C. 6,824,000
D. 17,576,000

Respuesta :

You can choose any number from 10 possibilities, and the number can be repeated.
The number possibilities are: 10^3
Applying the same method the letters possibilities are: 26^4

By multiplying them the final result is: A. 456,976,000

A. 456,976,000 ~~~~~~~~~~~ APEX

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