Archived Stumpers (with solutions)
STUMPER #1.4: LETTER MATH
(Did you solve something differently? There's almost always more than one way to solve
a math problem. Sometimes there's even more than one correct solution!)
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What’s the missing letter in each sequence below?
• A D G J ? P • A B D ? K P • A Z B ? C X • O T ? F F S • I V ? L C D M
* Solution
ADGJMP (each letter is 3 letters after the one before). ABDGKP (the second letter is 1 after the first; the third is 2 after the second; the fourth is 3 after the third, and so on). AZBYCX (the first pair are the first and last letters of the alphabet; the second pair are the second and secondtolast, etc.) OTTFFS (They're the first letters of the counting numbers: One, Two, Three, Four, Five, Six). IVXLCDM (the different letters used in Roman Numerals, in order). 