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Largest possible pipcount for race leader?

Posted By: Stick
Date: Saturday, 3 July 2010, at 1:13 p.m.

In Response To: Largest possible pipcount for race leader? (Bob Koca)

That would be 15 X 25. If you notice that one number is 5 lower than 20 and the other is 5 greater than 20 you should be able to see the relevance of the identity (x+y)(x-y) = x^2 - y^2 and can calculate perhaps more quickly as 25 x 15 = (20 + 5)(20-5) = 20^2 - 5^2 = 400 - 25 = 375.

My thoughts exactly.

Stick

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