To find a pythagorean triplet, we take an odd no, say 13(first member of the triplet), square it, it is 169. Now, we got to divide this squared no by 2, hence it is 169/2, which gives us 84 as quotient. This 84 is the second member in the triplet. Add 1 to it, giving us 84+1=85, which being the last member in the pythagorean triplet.
So, it s 13-84-85 !
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