Here is a video solution for ISI Entrance Number Theory Problems based on AM-GM Inequality Problem. Watch and Learn!
Here goes the question...
a, b, c, d are positive real numbers. Prove that: (1+a)(1+b)(1+c)(1+d) <= 16.
We will recommend you to try the problem yourself.
Done?
Let's see the proof in the video below:
I.S.I. & C.M.I. Entrance Program
Taught by students and alumni of I.S.I. & C.M.I.
