Here is a question I think there is a red robin it says all uppercase or lowercase
A password on a certain computer system is known to be composed entirely of upper or lower case alphabetic letters without repetition.
If the password is eight characters long, what is the probability of randomly guessing the password?
My solution would be as follows 26P8 = 6.2999(Big number)
This is because the user must choose between 26 upper or lowercase characters
You lost the exponent on $26P8$. The value (even if the exponent is supplied) is not quite correct-there is a zero after the first two $9$s. You should also multiply by $2$ because you get to choose the case of the first letter-all the rest must follow that choice. Finally, the probability should be less than $1$, so you need to take the inverse.