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Old 2021-12-02, 13:04   #1
Xyzzy
 
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Aug 2002

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Default December 2021

https://research.ibm.com/haifa/ponde...ember2021.html
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Old 2021-12-02, 13:40   #2
uau
 
Jan 2017

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The example doesn't seem to match the given score.
With n=5 and m=15, the last term in the sum (k=5) is:
(n * a[s[k]] / m)**k = (5 * 6 / 15)**5 = 2**5,
which alone is much more than the claimed total sum of 1.25.

Also the distribution variables are first said to use 1-based indexing, even though the permutation then used with them uses 0-based indexing - taken literally, the a[s[k]] part would result in a "list index out of range" failure.
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Old 2021-12-02, 13:52   #3
Dr Sardonicus
 
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Feb 2017
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Quote:
Originally Posted by Xyzzy View Post
Quote:
such that if a ball hits a pin, it as equal probability to fall to the right or to the left
They need a proofreader! That should be has!

Leave making typos to me - I make enough for everybody!
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Old 2021-12-03, 03:08   #4
EdH
 
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"Ed Hall"
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Quote:
Originally Posted by Dr Sardonicus View Post
They need a proofreader! That should be has!

Leave making typos to me - I make enough for everybody!
I'm surprised you didn't mention the other two in the same paragraph:
Code:
... above which are places rows of pins, ...
...
... funnel from which balls drop balls on the pins.
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Old 2021-12-03, 09:29   #5
SmartMersenne
 
Sep 2017

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With so many ill-defined problems, I am OK to ignore all English errors.

The quality of the puzzles really dropped since the puzzlemaster has changed. There are always some mistakes in the problems, and it is happening every month, now.

There is also the problem of infrequent feedback and updates to the website.
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Old 2021-12-08, 14:32   #6
tgan
 
Jul 2015

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Default December Puzzle was updated

Puzzle was updated

it is multifurcation and not sum
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