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 Row on Row (Posted on 2006-12-11)
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.

PART 1
Now, how many coins are needed to make as many rows of 3 as there are coins?

PART 2
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: ( Back to comment list | You must be logged in to post comments.)
 PART 2 | Comment 2 of 10 |
I can do 15 rows of 4 using 16 coins . . . not quite the answer.
 Posted by Leming on 2006-12-11 13:15:33

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