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Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.

Q: What are the the 3 digit numbers using 1345678?

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210

24

321 312 213 231 123 132 6 3 digit numbers.

There are 5 numbers which can make the 3 digit numbers in this example. Therefore each digit in the 3 digit number has 5 choices of which number can be placed there. Therefore number of 3 digit numbers = 5 x 5 x 5 = 125

106------------------------------------------------------------------------------------------------From Rafaelrz.You can make, 4P3 = 4!/(4-3)! = 24, different 3 digit numbers using 1, 2, 3 and 4.

Related questions

There are 27 of them.

210

-24686

24

321 312 213 231 123 132 6 3 digit numbers.

There are 5 numbers which can make the 3 digit numbers in this example. Therefore each digit in the 3 digit number has 5 choices of which number can be placed there. Therefore number of 3 digit numbers = 5 x 5 x 5 = 125

You can make 4*3*2/2 = 12 numbers.

106------------------------------------------------------------------------------------------------From Rafaelrz.You can make, 4P3 = 4!/(4-3)! = 24, different 3 digit numbers using 1, 2, 3 and 4.

3 digit numbers are lessthan 4 digit numbers

3! = 6.

If you can repeat a digit, there are 27. If you can't repeat a digit, there are only 6.

81 As there are no limits stated then you can have a number comprising a repeated single digit (such as 2222), two pairs of numbers (e.g. 2244) or three different numbers (such as 2462). The first digit can be one of any of the 3 numbers. The second digit can be one of any of the three numbers, as can the third digit and also the fourth. Then you can have 3 x 3 x 3 x 3 = 81 different 4-digit numbers using the three given numbers.