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Letters - 26

Numbers - 10

Total chacters - 36

If characters can be repeated (QQ and 44 are acceptable): 36 x 36 = 1,296

If characters can't be repeated (GG and 99 not acceptable): 36 x 35 = 1,260

If characters can't be repeated and the sequence

doesn't matter (X7 and 7X are considered to be the same): 630

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Q: How many possible alpha numeric combinations using upper case letters and numbers for two chacters?
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