Feeds meet maths

January 23, 2009 at 4:40 pm 1 comment

Here’s a challenge (and quite beyond yours truly):  we have 600 news feeds in our list.  All of these feeds can be cross-referenced, stacked, or blocked from each other. 

For instance, you can combine feed A and feed B to make feed C.  Or, you can block feed B from feed A and make a new feed D.  Finally the feeds can be cross-referenced: articles that appear in feed A and feed B create new feed E.  You can use those 3 options in combination, and with as many feeds as you like, for example you can cross reference 10 feeds with another 10 feeds, from which you block another 5.

So the challenge is this (and ignoring the fact that not all feed combinations will make for sensible results): 

How many possible feed combinations can you make? Presumably there is a limit. Initially I thought 600-squared (360,000), but that doesn’t seem right, it must be more?

Unfortunately no prize for the brave and brilliant soul who can answer this question!  Though expect a bag of respect and your number may well make it into the Moreover “we have THIS many feeds” marketing blurb (saved for posterity ever after).

Entry filed under: web aggregation.

Your uservoice heard Blogs White List now at 250k

1 Comment Add your own

  • 1. Sandy McKinnon  |  March 16, 2009 at 12:08 pm

    Guys – surely this is just simple combinatorics – it should be just n choose k – if you want n feeds out of 600 possible – check out http://mathworld.wolfram.com/Combination.html


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Trackback this post  |  Subscribe to the comments via RSS Feed

Moreover Technologies is a 2011 SIIA CODiE Awards Finalist

RSS Editor’s Pick…

  • An error has occurred; the feed is probably down. Try again later.

  Bookmark and Share
wordpress counter

Latest Tweets


%d bloggers like this: