# If using numbers 1 through 9 how many different 4 digit combinations can be made with no restrictions on order or repeats?

Each digit can appear in each of the 4 positions.

There are 9 digits, therefore there are 9⁴ = 6561 such combinations.

### How many 3 digit combinations can be formed using 0 5 7 8?

Assuming you are using combinations in the colloquial way (which is the mathematical "permutations" where order of selection does matter) to create a 3 digit number that does not start with 0, ie creating a number that is between 100 and 999 inclusive then: If repeats are not allowed there are 3 × 3 × 2 = 18 possible numbers If repeats are allowed, then there are 3 × 4 × 4 = 48 possible…

### What are all 5 digit combinations with 1-9?

from 1-9 have 9 numbers so that we have 9*9*9*9*9=59049 Consider the case of 5-digit number combinations, where each is some digit from 1 through 9. There are 9 different digits you can pick for the first number. Assuming you can have repeats, there are 9 you can pick for the second, 9 you can pick for the third, and 9 you can pick for the fourth and 9 you can pick for the fifth.

### How many number combinations can you make out of the numbers 1-6?

Assuming no repeated digits, 720; allowing repeats 66 ie 46656. * * * * * No, 720 is the number of permutations! In a combination, the order does not matter. So without repeats, there are 2n-1 = 63 combinations. Of these, 1 will consist of all 6 digits 6 will consist of 5 digits 15 will consist of 4 digits 20 will consist of 3 digits 15 will consist of 2 digits 6 will consist…

### How many 5 numbers combinations can you make from the numbers 1 to 49 and you can use multiple combinations but still use each number only once?

If the 1, 2, 3, 4 and 5 each appear in the numbers (no repeats, no eliminations-- so numbers like 11133 are not valid) then there are 120 combinations. If you can use any of the 5 any number of times up to a max of 5 times, (any possible way of making a 5 digit number using only 1, 2, 3, 4 and 5, so that 33455 for example is valid) then the number…

### How many 3 number combinations are there in the numbers 1 to 6?

I'm not confident that my calculations are correct; I'm withdrawing my attempt. My guess is that if repetition of numbers is allowed, and if the order of the numbers is important (663 is distinct from 366) then there are 216 possibilities. With repetition but no particular order, I think the number is 186 possibilities. * * * * * Combinatorial theory is based on the premise that the order of the numbers does not matter…

### What numbers can be made using the digits 4 2 1?

The numbers: {1, 2, 4, 12, 14, 21, 24, 41, 42, 124, 142, 214, 241, 412, 421}. If repeats are allowed, the above plus: {11, 22, 44, 111, 222, 444} plus infinitely many more by preceding the numbers given so far by various combinations of {1, 2, 4} in 1, 2, 3, ... digit groups making 4, 5, 6, ... digit numbers.

### How can you tell if a table of values represents a function?

If all the values of the "independent" variable (x) are different then it is a function. If there are any repeats of the independent variable, the corresponding dependent variable, y, must be the same. If all the values of the "independent" variable (x) are different then it is a function. If there are any repeats of the independent variable, the corresponding dependent variable, y, must be the same. If all the values of the "independent"…