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Q: How many combinations are there for a four digit number?

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How many four digit combinations can be made from the number nine? Example, 1+1+2+5=9.

There are 5,461,512 such combinations.

7

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

There are 360 of them.

There are 4,500 combinations.

6 of them.

It depends on how many digit you are choosing from.

I am assuming you mean 3-number combinations rather than 3 digit combinations. Otherwise you have to treat 21 as a 2-digit number and equate it to 1-and-2. There are 21C3 combinations = 21*20*19/(3*2*1) = 7980 combinations.

There are 12C4 4 NUMBER combinations. And that equals 12*11*10*9/(4/3/2/1) = 495 combinations. However, some of these, although 4 number combinations consist of 7 digits eg 1, 10, 11, and 12. Are you really sure you want 4-DIGIT combinations?

44

the answer is = first 2-digit number by using 48= 28,82 and in 3 digit is=282,228,822,822

The answer will depend on how many digits there are in each of the 30 numbers. If the 30 numbers are all 6-digit numbers then the answer is NONE! If the 30 numbers are the first 30 counting numbers then there are 126 combinations of five 1-digit numbers, 1764 combinations of three 1-digit numbers and one 2-digit number, and 1710 combinations of one 1-digit number and two 2-digit numbers. That makes a total of 3600 5-digit combinations.

How many numbers are there between 0000 and 9999?

The answer is 3,584. The first digit of the four-digit number can be one of seven figures: 1,2,4,5,7,8 or 9 (if it is 0, then you don't have a four-digit number!) Each of the remaining digits can be one of eight figures: 1,2,4,5,7,8,9 or 0. The number of possible combinations is therefore 7 x 8 x 8 x 8 = 3,584.

There are 15180 combinations.

How many place combinations in a four digit number and all have to go in different spot example: 1234, 4321, 2134 etc. numbers can't change and have to stay four numbers?The answer would be 36 different combinations. This is simply the counting principle and it's easy for anyone to learn.

There are 126 different 5 digit combinations. Note that the combination 12345 is the same as the combination 45312.

There are twelve possible solutions using the rule you stated.

There is only one combination. There are many permutations, though.

there are 10 possibilities for the first spot, 9 for the second, 8 for the third 10x9x8=720 combinations

There are 38760 combinations.

about 12

10,000 combinations.

There are 9C2 = 9*8/(2*1) = 36 2-digit combinations.