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Puzzle
The hint - world cup medallions
Monochromatic cows
Puzzle No. 6
Can you collect the whole set?
Puzzle No. 6 - world cup medallions
Complex multiplication
Three-digit numbers
Puzzle page
Are your multiplication problems real or imaginary?
Yet more taxis!
The coin tossing problem
Three doors
Puzzle page
I'll take door number three...
The taxi problem revisited
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