SOLUTION: Student ID's at a school consist of two letters followed by two single-digit numbers. How many possible ID's are there? How many possible ID's are there if neither letters nor digi
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Question 743695: Student ID's at a school consist of two letters followed by two single-digit numbers. How many possible ID's are there? How many possible ID's are there if neither letters nor digits can repeat?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Student ID's at a school consist of two letters followed by two single-digit numbers.
Pattern: LLDD
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How many possible ID's are there?
Ans: 26^2*10^2 = 67600
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How many possible ID's are there if neither letters nor digits can repeat?
Ans: 26*25*10*9 = 58500
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Cheers,
Stan H.
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