You are working for a farmer, who gives you ten trees to plant. He tells you:

"I want you to plant these ten trees in five rows. There must be exactly four trees in each row. "

How do you plant the trees?

You'd probably need a piece of paper and a pencil for this...

a) Draw a line.
b) Draw another line that would cross line # 1.
c) Draw a third line that would cross both lines #1 and #2.
d) Draw a fourth line that would cross lines #1, #2 and #3.
(Now, you'll see that each line has three intersection points on it)
e) Draw a fifth line that will cross lines 1, 2, 3, 4 -- it's really not hard, just extend the original four lines a bit.

Now, each line will have four intersection points from cross-overs with other lines.

Now count all intersection points -- there are ten of them. That's where you will plant your trees.

Thus we have -- 10 points (trees) along five lines(rows). Each row has four trees on it. Voila.

Posted by yasha on 2002-04-23 06:31:13