SOLUTION: A school code consists of two letters followed by 3 digits. The first letter must be K, F, S, T, U, or I. How many codes meet this description? How many codes meet the additional

Algebra ->  Probability-and-statistics -> SOLUTION: A school code consists of two letters followed by 3 digits. The first letter must be K, F, S, T, U, or I. How many codes meet this description? How many codes meet the additional      Log On


   

Question 667969: A school code consists of two letters followed by 3 digits. The first letter must be K, F, S, T, U, or I. How many codes meet this description? How many codes meet the additional restrictions: no repeated letter, and no digit can be the 0 digit?
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,

A school code consists of two letters followed by 3 digits.  

The first letter must be one of 6 letters: K, F, S, T, U, or I. 26-6+=+20

 How many codes meet this description? 6%2A26%2A10%2A10%2A10

How many codes meet the additional restrictions: no repeated letter, and no digit can be the 0 digit?

6%2A20%2A9%2A9%2A9