# A fraction

1. Feb 19, 2005

### symplectic_manifold

Hey, Guys...the following problem from IMO 1959, the very first: Prove that the fraction (21n+4)/(14n+3) is irreducible for every natural number n.
...just can't get what is meant by the given solution: 3(14n+3)-2(21n+4)=1...I mean, what is their "sample" method?!...can't see through...tried to get the same...no chance.