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Smith and Jones

Mr Smith and Mr Jones are two maths teachers. By asking questions, the answers to which may be right or wrong, Mr Jones is able to find the number of the house Mr Smith lives in... Or not!

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Binomial Coefficients

An introduction to the binomial coefficient, and exploration of some of the formulae it satisfies.

Spot the Card

Stage: 4 Challenge Level: Challenge Level:1
The recursive case is an interesting one. The trick ends in only one of two possible outcomes – can you explain shy? Can you find a link between the number of cards and the number of rearrangements necessary to find a solution?