[Raghav Agrawal]

Given that the numbers belong to the set of positive integers and 4+f(2) divides 2f(2)+2 therefore, the latter is smaller than Former also the numbers need to be integer hence, f(2) must be equal to the value where we plug in 2 which again satisfies that F(n) must be less than and now even equal to 'n'.

I hope i wad able to make myself clear!

 

[Raghav Agrawal]

Use Jensen's inequality for the latter half of the proof maybe it helps!

[Raghav Agrawal]

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