Question 667969
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
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*26*10*10*10}}}
How many codes meet the additional restrictions: no repeated letter, and no digit can be the 0 digit?
{{{6*20*9*9*9}}}