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Q: How many four digit numbers can you make using 0-9 only using each number once?

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998,000

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

There are four of each.

the place of each digit help the value of the number by using your multuplication

-123456786

24 = 4*3*2*1 of them

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.

61

This is not possible, since there are only five single digit odd numbers, which are 1, 3, 5, 7 and 9.

add numbers below to each number at the top

6*5*4*3=360

For each number, there are four digits, and for each digit, there are two possibilities for digits: 3 or 4. So the number of 4-digit numbers is 2*2*2*2 = 16. The 4-digit numbers using 3 and 4 are: 3333 3334 3343 3344 3433 3434 3443 3444 4333 4334 4343 4344 4433 4434 4443 4444

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