O1. let f = q and f(x) = x - 13 then find the order of galois group of f(x).

The order of a Galois group, G, of a polynomial of the type f(x)= X^n−a over Q, with a,n∈N is |G|=n⋅φ(n) φ(n) Euler function here n=2 so orders of G =2xφ(2)=2x1=2