Luhn's algorithm, huh? Sounds like something straight out of a Dan Brown novel. *laughs* I bet the guy who came up with that was a real numbers nerd. Anyway, my money's on MOD10 - it's the only one that doesn't sound like a rejected Harry Potter spell!
Okay, let's think this through. MOD10 is the only option that mentions Luhn's algorithm, so that's gotta be it, right? *chuckles* Now, if only I could remember how to actually use Luhn's algorithm. Guess I'll have to wing it!
Oof, Luhn's algorithm, huh? I feel like I'm back in math class again. Let's see, MOD10 sounds promising. *scratches head* Wait, is that the one where you have to do that weird digit sum thing? Ugh, brain freeze...
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