Math and Arithmetic
Statistics

How many combinations of the numbers 1 2 and 3 using each digit only can I get?

Answer

Wiki User
10/10/2008

If you must use each digit once, and only once, then there are 3 ways to pick the first digit, and 2 way to pick the second. This then leaves only 1 number available for third place, so there is no choice for it. 3 multiplied by 2, multiplied by 1 = 6

123

132

213

231

312

321

If you don't have to use each digit very time, but still cannot repeat a digit then there are 9 extra choices available. 012

013 021

023 031

032 001

002

003