Since the order of the digits does not matter there are only five combinations: 1234, 1235, 1245, 1345 and 2345.
120 5-digit numbers can be made with the numbers 12345.
Number of 7 digit combinations out of the 10 one-digit numbers = 120.
13579
It depends. If you can only use each number once, there are 720 combinations. If you can use numbers multiple times, then there are 1000 combinations, by using all numbers from 000 to 999.
125
7
There are a huge number of combinations of 5 numbers when using the numbers 0 through 10. There are 10 to the 5th power combinations of these numbers.
120 5-digit numbers can be made with the numbers 12345.
There are infinitely many numbers and so infinitely many possible combinations.
Number of 7 digit combinations out of the 10 one-digit numbers = 120.
9000
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.
Using the formula n!/r!(n-r)! where n is the number of possible numbers and r is the number of numbers chosen, there are 13983816 combinations of six numbers between 1 and 49 inclusive.
13579
Using the combination fuction, chose three numbers from 45 numbers. The answer is 14,190.
It depends. If you can only use each number once, there are 720 combinations. If you can use numbers multiple times, then there are 1000 combinations, by using all numbers from 000 to 999.
36324