A computer password is to consist of five alphanumeric chara

A computer password is to consist of five alphanumeric characters with no repeats. (An alphanumeric character is a letter from A to Z or a digit from 0 to 9.) How many such passwords are there?

______Passwords

How many are there if the letter O and the digit 0 are excluded to avoid confusion?

_____Passwords

Solution

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a) No of alphanumeric characters : - 26 +10 = 36 Characters

No of passwords possible = 36C5 X 5! (where 36C5 is the number of ways of selection of 5 characters from 36 characters)

=

b) If letter 0 and letter O are excluded

= 34C5X5!

=

Answer