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Earn +20 ptsQ: What are the 5-number combinations not using any number twice?
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How many different four digit combinations are there of the numbers zero through nine and using one number twice in the combination?
There are 360 of them.
What are the combinations of 1 through 10 with out using them twice?
There is 1 combination of all ten numbers, 10 combinations of one number and of nine numbers, 45 combinations of two or eight numbers, 120 combinations of three or seven numbers, 210 combinations of four or six numbers and 252 combinations of five numbers. That is 1023 = 210 - 1 in total.
If you create a password using 4 numbers 0 through 9 how many different combinations are there without using the same number twice?
This is a factorial problem. The first number can be any of ten digits, the second any of nine (because you can't repeat a digit), the third any of eight and the fourth any of the remaining 7 digits. 10x9x8x7=5040 combinations.
How many 4 number combinations are there using 1 2 3 4 5?
There are 120 permutations and 5 combinations.
How many 4-number combinations using numbers 0-9?
9000
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