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a = 1; b = 2; c = 3 111 + 222 = 333
what is the greets possible 9 digit number that uses each of the digits 1-3 times
There are 5 numbers which can make the 3 digit numbers in this example. Therefore each digit in the 3 digit number has 5 choices of which number can be placed there. Therefore number of 3 digit numbers = 5 x 5 x 5 = 125
100000 2847239582
4 options for the first digit, 3 options for the second digit, 2 options for the third digit. Multiply the number of options together, and you find how many 3-digit numbers you can get.