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	towers of cubes		1999-10-05
		From Sanker: I need help to solve this Rules for bulding towers of cubes rule 1 The number of cubes on the bottom layer is always one less than the number of squares on the grid rule 2 Each new layer is made with one cube less than the layer underneath it. Investigate how many different arrangements there are of 4 cubes on top of 5 cubes on a two by three grid investigate the number of different arrangements of six cubes on top of seven cubes on a two by four grid investigate the relation between the number of arrangements of cubes and the size of the grid when there are two layers of cubes when there are more than two layers of cubes Answered by Walter Whiteley.
	Towers of Hanoi		1999-09-03
		From Jeni: In the puzzle called the Towers of Hanoi there are three peg and you are asked to move the rings from one peg and stack them in order on another peg. You can make as many moves as you want, but each move must consist of moving exactly one ring. Moreover, no ring may be placed on top of a smaller ring. The minimum number of moves required to move n rings is 1 for 1, 3 for 2 rings, 7 for 3 rings, 15 for 4 rings, and 31 for 5 rings. Find a formula for this sequence. What is the minimum number of moves required to move 6 rings? Answered by Penny Nom.

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