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 crossovers 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 20020423 06:31:13 