Q: How many 5 digit combinations are there from 1-20?

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120 5x4x3x2x1=120

105 = 100000

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.

4+4+4+4+4= 20

There are 5! = 120 such numbers.

Related questions

Possible 5 digit combinations using 5 digits only 1 time is 5! or 5*4*3*2*1 or 120. Using 5 digits where numbers can be used 5 times is 55 or 3125.

If no digit can be repeated then there are 5 combinations, abcd, abce, abde, acde and bcde. If you regard abdc as different from abcd then each of the 5 basic sets could be arranged 24 ways and the total would be 120 combinations.

There are 5*4*3*2 = 120 such numbers.

There are 5,461,512 such combinations.

There are 1140 5 digit combinations from 1 to 20. 20 combination 3 computes that.

5 digit combinations for numbers 1 to 50= 50 C 5N!= 1x2x3x4x...x (N-1) x N= (50!)/(45!x5!) =(50x49x...x2x1)/((45x44x...x2x1)(5x4x3x2x1))=(50x49x48x47x46)/(5x4x3x2)=254251200/120 =21187602118760 combinations

120 5x4x3x2x1=120

105 = 100000

Just 1.

about 1,0000000000000

120

It depends on how many digit you are choosing from.