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Are you allowed to use a digit more than once? I will assume not:
There are 8 choices for the first digit. One digit has been used, so there are only 7 choices for the 2nd digit. ... 6 for the 3rd, etc.
The total number of numbers is 8x7x6x5x4 = 56x30x4 = 56x120 = 6720.
If you are allowed to repeat digits, then the answer is 85 = 32,768.
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How many 1 digit numbers can make with 123 digits?
With 123 digits you can make 123 one-digit numbers.
How many 3-digit numbers can you make from the digits 1.2 and 3?
6 if all digits are different, 27 otherwise.
How many numbers can you make from 650271 without repeating a digit?
1,956 different numbers can be made from 6 digits. You can calculate this by using the permutation function in a summation function, like this: Σ6k=1 6Pk = 6P1+6P2+...+6P5+6P6 What this does is calculate how many 1 digit numbers you can make from 6 digits, then how many 2 digit numbers can be made from 6 digits and adds the amounts together, then calculates how many 3 digit numbers can be made and adds that on as well etc.
How many 4 digit numbers can you make with 10 digits?
Ten different digits can be used to make 10C4 = 10*9*8*7/(4*3*2*1) = 210 four-digit numbers. Either numbers starting with 0 are permitted or the 10 digits do not contain a 0.
How many four digit numbers can you make with the digits 1 2 3 4?
4! = 24 ■
