If they say f(4)=2, then can we give it some boundries like f(12)<f(20)<f(24) or is it gonna be undefined? 4 <f(20)<16
You’d need to know that the function is increasing in that interval to surmise f(12) < f(20) < f(24)
oh, would they ask this type of question in gre? If yes, then how to surmise whether its increasing or decreasing?
Well it looked like you picked a random triple of numbers, so in general to see increasing inputs → increasing output, you’d require an increasing function
The actual question is ill-posed because f(20) is not constrained by f(4), so f(20) can’t be uniquely determined.
I’ll provide some examples in a bit for possible f(x) in a bit
This, so @user4724, where did you find this question?
At 34:08
