The Cars For Kings Company is putting out the new models. They want to put a 4-digit number on the back of each new model car. They have decided to use only the numerals 2,5,7,8. Each numeral can only be used once in a number. How many different numbers can the Cars For Kings Company put on the backs of the new model cars?
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Oh, dude, you can make 24 different 4-digit numbers using the digits 2, 5, 7, and 8. It's like a combination lock, but with numbers. Just mix and match those digits and voila, you've got yourself a bunch of 4-digit numbers. Math can be fun, who knew?
20 of them, if repetition is not allowed.
It is: 9C7 = 36
120 5-digit numbers can be made with the numbers 12345.
There are 60480 numbers.