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Q: How many combinations to make 40 by using the numbers 12 and 4?

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Their is 25 combinations

26 = 64 combinations, including the null combination - which contains no numbers.

1000

There are 125970 combinations and I am not stupid enough to try and list them!

Using the combination fuction, chose three numbers from 45 numbers. The answer is 14,190.

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.

how many combinations of 4 numbers are there in 7 numbers

There are 252 combinations.

4!=4x3x2x1=24

64

Number of 7 digit combinations out of the 10 one-digit numbers = 120.

There are infinitely many numbers and so infinitely many possible combinations.

How many numbers are there between 0000 and 9999?

4582

137, 173, 317, 371, 713, 731 Six combinations can be made.

You can make 5 combinations of 1 number, 10 combinations of 2 numbers, 10 combinations of 3 numbers, 5 combinations of 4 numbers, and 1 combinations of 5 number. 31 in all.

You could make 10*10*10*26*26*26 combinations, or 17576000 combinations.

9000

9

120 combinations using each digit once per combination. There are 625 combinations if you can repeat the digits.

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.

36324

The number of combinations of 7 numbers from 10 is 10C7 = 10*9*8/(3*2*1) = 120

There are 59C5 = 59*58*57*56*55/(5*4*3*2*1) = 5,006,386 combinations.

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.