How many possible passwords can be there?

Question

You ask your friend his wifi password;
He says: 123456
Plot twist:
Actually, the password is "244456".
Examples: 2355556, 1244466666
How many possible passwords can be there?

Answer 1

Start learning permutation and combinations chapter.. you may get the answer.

Thanks.

Answer 2

If you have a source set of numbers from 0 -> 9 you have 10 members in total. When you want to get subsets of 6 places from the members of the source set you will get 151200 different permutations.

The more places your new subsets will hold, the more different subsets you will get. If you use 7 places instead of 6, the result will be 604800.

Answer 3

Please post programming relayed questions here. Don't post irrelevant questions. You can post it in activity feed.

https://www.sololearn.com/discuss/1316935/?ref=app