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* * * * * 1 votes

Slicing a pizza a whole different way


Best Answer TimeSpaceLightForce, 13 May 2013 - 03:23 AM

Spoiler for

          

Go to the full post


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12 replies to this topic

#11 bonanova

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Posted 14 May 2013 - 10:58 AM

Spoiler for gold star - second attempt

 

That rings the bell. Well earned. bona_gold_star.gif

 

Another form is nC4 + n-1C2 + n


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The greatest challenge to any thinker is stating the problem in a way that will allow a solution.
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#12 dark_magician_92

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Posted 14 May 2013 - 03:39 PM

any explanation please
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#13 witzar

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Posted 14 May 2013 - 04:07 PM

any explanation please

A problem is similar to http://brainden.com/...or-of-a-circle/ (see my solution).

You are adding new point on the circle and drawing new chords. For each chord you count intersections with old chords and add 1, this gives you the number of new regions. This is how you arrive at the formula. Last step is to simplify it.

But to be honest I just guessed the solution :)

I took the formula from above mentioned problem and made an adjustment for that extra 1s. Few tries and it worked.

 

Edit: Guessing helped me only in the last step (simplification). I needed non-simplified formula to verify guessed one.


Edited by witzar, 14 May 2013 - 04:13 PM.

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