Question

I want to make combition of 6 numbers from digit 1234567890

Answer 1

Answer:

The obvious answer is 10^6 meaning one million, but that includes numbers like 000046 , so if you want numbers that 'have' six digits but are actually smaller the answer is one million options.

If you want to find six digits numbers we're going to have to subtract the numbers 000000–099999 because they're not technically six digit numbers. This means

1,000,000-(99999–0+1)= 900,000 so nine hundred thousand different numbers