Problem 3: Password

Posted: March 3, 2011 in Problems

astrodroids

You are an astrodroid. Your masters are trapped behind a large, password-protected, door. The password consists of three numbers from 0-9 and then 3 letters from a-z.

a) How many possible passwords are there?

b) Which would reduce the possible passwords more, knowing the 3 letters or knowing the 3 numbers? How many possible passwords are there if you know those 3?

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