Project: 4TU.AMI
Challenge:
Santa Clause tells the three super-smart elves Alpha, Beta, and Gamma, “Each of you has received a card that carries a number from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. Your three numbers are pairwise distinct, and the largest one equals the sum of the two smaller ones. Now, please have a look at your cards with your number, but don't show it to the two others!”
Alpha, Beta and Gamma stare at their cards for some time.
Of course, we would like to know: What is Alpha's number?
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Possible answers: