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ella [17]
3 years ago
7

A student ID number is a letter of the alphabet followed by 2 digits. How many different IDs are possible if the digits can be r

epeated?
Mathematics
1 answer:
mars1129 [50]3 years ago
4 0
First, there are 26 distinct alphabets and 10 distinct digit numbers.

Then, the first digit of ID has 26 possibilities.

For the rest of 2 digits, the total cases are 10*10 = 100 possibilities.

However, there are 10 cases are repeated when two digits are the same. so you have  to subtract it by 10

So answer will be 26 * (100-10) = 23400

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Answer:

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Mashcka [7]
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8 0
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dezoksy [38]

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