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Q: How many 3 digit numbers have the sum of their digits equal to 5?

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There are no three-digit numbers that equal 17. In fact, there are no numbers with more or less than two digits that equal 17. In fact, in the whole infinite supply of numbers, there is only one single number that equals 17. That number is . . . . . . . 17 .

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

There are 5*4*3 = 60 such numbers.

24

2

Related questions

21.

21

There are 15 of them.

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

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

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

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

There are no three-digit numbers that equal 17. In fact, there are no numbers with more or less than two digits that equal 17. In fact, in the whole infinite supply of numbers, there is only one single number that equals 17. That number is . . . . . . . 17 .

There are 90000 5-digit numbers.

757

7 two-digit numbers.

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.