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Arrange ten coins in five straight lines such that each line contains 4 coins?

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posted Jul 21, 2014 by anonymous

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2 Solutions

+1 vote
 
Best answer
solution Jul 29, 2015 by Jcm
0 votes
solution Jul 23, 2014 by Tapesh Kulkarni



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In this picture you can see 6 coins in the shape of a cross. Moving just ONE coin, can you form 2 lines, each with 4 coins?

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+2 votes

It is quite easy to place four coins in such a way that each penny touches every other one. Just place three of them on the table in the form of a triangle so that they touch one another, and then lay the fourth coin on top of this triangle - as shown in the following figure on the far left.

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Now add one more coin and try to do the same thing with five coin - again every coin has to touch every other.

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You have three houses or squares drawn on paper and below them three smaller squares representing gas, water, and electric. Can you draw a line and get each utility into every house (9) total lines, without crossing over any line?

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