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There are different numbers of combinations for groups of different sizes out of 9:

1 combination of 9 digits

9 combinations of 1 digit and of 8 digits

36 combinations of 2 digits and of 7 digits

84 combinations of 3 digits and of 6 digits

126 combinations of 4 digits and of 5 digits

255 combinations in all.

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Q: How combination in a 9 digit number?
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Related questions

How many 6 number combination can be made from 0 to 9?

For a six digit number the most significant digit cannot be zero (it will otherwise cease to be a six digit number). So MS digit can be 1,2,3,4,5,6,7,8, or 9. The Other five digits can be 0,1,2,3,4,5,6,7,8, or 9. Hence total number of six digit numbers that can be made with 0 to 9 is 9 x 10 x 10 x 10 x 10 x 10 = 900000


Is the single digit number greater than 9?

There is no single digit number greater than 9. After 9 is 10, which is a double-digit number.


What is the Units Digit of 9 to the 21st?

The number in the units digit of the number 921 is 9.


What is the sum of greatest 3-digit number?

The greatest 3-digit number is 999. 9+9+9 = 27 The sum of the greatest 3-digit number is 27.


What is the greatest 9 digit number with no digit rejected?

With no digit rejected, 999999999 With no digit repeated, 987654321


How many 9 digit numbers are there?

well the first 9 digit number is 100 million 100,000,000 the last 9 digit number is 999 million 999,999,999 just minus the two numbers and you get... 899,999,999 so there are around 900 million 9 digit numbers.


What is digit in real number?

Digit is not a real number unless it is 0-9


What is the value of the digit 9 in the number 987?

The value of the digit 9 in the number 987 is 900 (nine hundred).


What three digit number is a multiple of 9?

999 is a three-digit multiple of 9


Which digit is in the tenth's place in the number 1465.98?

The digit in the tenths place of the number 1465.98 is the digit 9.


What is the greatest 1 digit number?

The number 9 is the greatest one-digit number.


What is the least 9 digit number no digit repeated?

123456789