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How many 2 digit numbers digits can be written in accending form?

90 of them.


How many two-digit numbers can be written using digits 2 and 8?

24


How many different three digit numbers can be written using the digits 1 through 9?

You can select 9 numbers for the first digit, 8 numbers for the second digit, and 7numbers for the third digit; so 504 (e.g. 9*8*7) different three digit numbers can be written using the digits 1 through 9.


How many 1 digit numbers can make with 123 digits?

With 123 digits you can make 123 one-digit numbers.


How many 5 digits numbers are there whose digits sum to 22?

There are 5460 five digit numbers with a digit sum of 22.


How many 8 digit palindromic numbers are there?

a 8-digits palindromic number is a number consisting of a 4-digits number written and then written backward, i.e. 1234 4321 so there are as many palindromic 8-digits numbers as 4-digits numbers so from 1000 to 9999, so there are 8999 palindromic 8 digits number (I assumed that 00011000 is not to be considered as a valid 8 digit number)


How many 3 digit numbers can be formed from the digits 357 with any digit repeated?

27 three digit numbers from the digits 3, 5, 7 including repetitions.


How many 4 digit numbers can be formed from digits 123456789?

5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.


How many three digit numbers have no repeated digits?

757


How many 5 digits are there?

There are 90000 5-digit numbers.


How many two digit whole numbers are increased by 18 when their digits are reversed?

7 two-digit numbers.


How many 4 digit numbers have 6 as their second digit?

There are 9 digits that can be the first digit (1-9); for each of these there is 1 digit that can be the second digit (6); for each of these there are 10 digits that can be the third digit (0-9); for each of these there are 10 digits that can be the fourth digit (0-9). → number of numbers is 9 × 1 × 10 × 10 = 900 such numbers.