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    NRICH
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    In this number puzzle/trick, learner #1 thinks of a number between 1 and 63. Learner #2 shows learner #1 six cards and asks them whether the cards contain their number. Learner #2 uses this...

    1 cent - $1 per group Ages 14 - 18 5 to 10 minutes

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    • Oregon Museum of Science and Industry (remove)
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