How many triangles?
Suppose that you have six rods, of length 1,2,3,4,5,6.
How many different triangles can you form from the rods?
Extend the result to 7, 8, 9... and, if you can, to 2n
(any even number) and 2n+1 (any
When will a set of three rods not
produce a triangle?
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