How many numbers can you make from 650271 without repeating a digit?

Answer 1

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.