I had a GRE practice test in which here was the question below, for which my answer was “A” as the greatest prime factor for 365 is 73, but the they are telling that the answer is “C”. Can you please explain it to me.
x^4 = 625. i.e. x=5
Prime factorize 36*5 = (2^2) * (3^2) * (5)
Greatest prime factor = 5 = x
Hence C.