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100 Geometric Games
E-bok,
2015,
Engelska,
ISBN 9780486805672
There are three loops in a tangle of rope. How many are independent, and how many are interlocked?Two knights stand on a chessboard. How many other knights must you add so that …
100 Numerical Games
E-bok,
2015,
Engelska,
ISBN 9780486805696
Follow the hour hand and minute hand of a clock for 24 hours. How many times do they form a right angle?Timothy's house has several rooms, each of which has an even number of …