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Puzzle of the Day

These puzzles are also printed in Eight days a week, a booklet published by the Association of Teachers of Mathematics.

What's next? A) 3, 3, 5, 4, 4, 3, 5 ..., B) O, T, T, F, F, S, S, ... (HINT - they are related)

Answer: eight and nine are the next two so 5, 4 aand E, N