Actually yes the answer is 2/3 but you people are saying the wrong concept,This doesn't become a composite function like that! isn't the range of f(x) the domain of g(x)??
Is this the official ms?
Like all the questions I've solved is literally nothing like this!
since range of f(x) is >4, substiuting 4 in g(x), it gives us 2/3 therefore 0<gf(x)<2/3 but we don't take the domain of f(x)