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Learn MoreHere 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:

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