> "Easily solved" It's already solved. If there are 3 kids, 1-3 go to kid A, 4-6 to kid B, 7-9 to kid C, and 0 means try again. There's no bias present in th

> "Easily solved" It's already solved. If there are 3 kids, 1-3 go to kid A, 4-6 to kid B, 7-9 to kid C, and 0 means try again. There's no bias present in this solution. Since it only takes a fraction of a second to generate a new digit with a stopwatch (using the hundredths of seconds digit) it's no big deal if you have to try five times. Your solution introduces unnecessary arithmetic (what's 47 mod 3?) and unnecessary psychological pressure (will the kids start an argument while you're figuring it out? Will the ones who are better at math start taunting the others?) and it introduces bias in a family as large as ours got (7 or 8 kids can't evenly divide 60; 3, 6, or 7 kids can't evenly divide 100.) A re-roll is simply a superior solution. [Appeal to authority: my dad had a math degree and was valedictorian of his engineering college. I have bachelors and masters degrees in applied math. My oldest brother competed at the national level in Mathcounts. We all agree this is the best practical solution for this problem. Based on the votes, so does the bulk of the technically-minded Hacker News community.]