How many 4 digit combinations are there with 10 numbers?
There are an incredible 10,000,000,000 4 digit combinations. How many numbers can you make with 3 numbers? You can make three numbers with three numbers by adding them together. How many four digit numbers can be formed from the digits 1234 without repetition? 1234 can be formed from the digits 12, 13, 14, 15, and ... Read more...