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Row on Row (Posted on 2006-12-11) Difficulty: 3 of 5
How many coins are needed to make as many rows of one coin as there are coins? The answer is 1: you make 1 row of one coin using that 1 coin.

How many coins are needed for rows of two coins? The answer is 3: put the coins in a triangle and you make 3 rows of two coins using 3 coins.

Now, how many coins are needed to make as many rows of 3 as there are coins?

If that was easy, how many for 4?

Note: if you are making rows of 4, any line drawn can intersect with a maximum of 4 coins. (you cannot place 5 coins in row and count it as two rows of 4) And no stacking coins.

No Solution Yet Submitted by Haruki    
Rating: 3.5000 (2 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionBetter no ambiguity solution for part 1 (spoiler)Steve Herman2006-12-14 12:20:34
Some ThoughtsPart 2 in 20 pointsTristan2006-12-12 13:29:22
No ambiguity solution for part 1Jer2006-12-12 10:41:22
Just to ClarifyHaruki2006-12-11 22:09:57
re(3): First Part (spoiler?)Steve Herman2006-12-11 17:06:15
re(2): First Part (spoiler?)TamTam2006-12-11 14:23:55
re: First Part (spoiler?)Steve Herman2006-12-11 13:42:21
First PartTamTam2006-12-11 13:19:32
PART 2Leming2006-12-11 13:15:33
Some ThoughtsA startLeming2006-12-11 13:04:04
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