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Problem #312

Kuti-Pi's Wet Farm

Kuti-Pi has a circular farm of radius 1 unit. He loves to irrigate his farm. For the next N days, he chooses a random point on his farm and irrigates a circular area concentric with the farm, passing through the chosen point. Let S be the total sum of the areas he has to irrigate in N days. The probability of S being less than x (0 < x < \pi) is P(x,N).

Calculate \mathbf{Ans} = \sum_{n=0}^{\infty}\: \pi^n\: P(\sqrt{3}, n) .

Report \lfloor \mathbf{Ans}\times 10^5\rfloor.

\lfloor a\rfloor denotes the Greatest Integer Function of a.

Contributed by Rudransh Aggarwal

Solved by 24 users

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