how many combinations are there with letters a - z twice and 1 - 9
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There are 26 alphabets and 10 digits from 0 to 9. Therefore there are a total of 26+10 = 36 different types of characters.
2 digit combinations that we can get with the 36 characters could be computed here as:
= 36*36
because there are 36 ways to fill each of the 2 characters.
= 1296
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