Much smaller actually.
10x10 numbers = 100
26x26 letters = 676
10x26 number + letter = 260
26 x10 letter number = 260
1/1296 or about .0007% chance.
English
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I was talking about just the first letter and last number.. 26 letters x 10 numbers is 260 possible options for guessing only the first and last
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They can both be either a letter, or a number. Meaning there are 36 options for both, 36x36=1296