This month's IEEE GlobalSpec newsletter challenge is:
A teacher writes six words on a board: “cat dog has max dim tag.” She gives three students, Donald, Elizabeth and Fred, each a piece of paper with one letter from one of the words. Then she asks, “Donald, do you know the word?” He replies yes without hesitating. She asks, “Elizabeth, do you know the word?” She thinks for a minute and replies yes. Then she asks Fred the same question. He thinks about it and then replies yes.
What is the word?
And the answer is:
Dog. Donald knows right away because he has one of the unique letters that only appear once in all the words: c o h s x i. So, we know the word is not “tag.” All of these unique letters appear in different words, except for “h” and “s” in “has,” and Elizabeth can figure out what the word is from the unique letters that are left: t, g, h, s. This eliminates “max” and “dim.” Fred can then narrow it down the same way. Because there is only one unique letter left, the letter “d,” the word must be “dog.”
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