Question

Give the 10 digits, you could create different 2- digits passcode ? You can only use each digit once

Answer 1

Given:

The total number of digits =10.

We need to create 2 digits passcode.

We can not repeat the digits.

II would appreciate your feedback - you can provide it by rating the session.n this case, we can use

`nP_r=(n!)/((n-r)!)`

Substitute n=10 and r=2, we get

`10P_2=(10!)/((10-2)!)`

`10P_2=(10*9*8!)/(8!)`

`10P_2=90`

We can create 90 different 2 digits passcode.