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Q: How many 9 digit combinations are there from 1 to 20-?

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50 to the 5th power.156,250 combination.

I can't

Combinations of 2: 20*19/(1*2) = 190 Combinations of 3: 20*19*18/(1*2*3) = 1140 Combinations of 4: 20*19*18*17/(1*2*3*4) = 4845 So 6175 in all.

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.

10 times for the one's digit, 1-100 10 times for the ten's digit, 60-70 = 20 times

Related questions

There are 1140 five digit combinations between numbers 1 and 20.

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

There are 167960 9 digits combinations between numbers 1 and 20.

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 5,461,512 such combinations.

There are 840 4-digit combinations without repeating any digit in the combinations.

Just 1.

7

100

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

44

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