The rods are:

Rational : 1,2,3 :

Irrational :sqrt (2),sqrt (3),sqrt (5),

5 of 20 possible triplets are Pythagorian.:

Rem1: I f you randomly select three rods there is a probability of 25% you will be able to create a right angled triangle..

Rem2: There might be other combinations.

*Edited on ***February 10, 2011, 1:03 pm**