<PRE><B>Question 584237</B>
Philippine peso bills are identified by serial numbers containing 8 characters. The first 2
characters are letters in the English alphabet (in any order) and the last 6 digit are numbers from
0 to 9. 
a. How many bills can be coded this way?
Pattern: LLNNNNNN
Ans: 26*26*10^6 = 676x10^6
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b. If each letter and each number can occur only once, how many bills can be coded in this way?
Ans: 26*25*10*9*8*7*6*5 = 98,280,000 
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Cheers,
Stan H. </PRE>