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September 18, 2014

September 18, 2014

Posted by **Audrey** on Sunday, September 18, 2011 at 5:11pm.

This doesn't make any sense! Please explain!

- MATH -
**Reiny**, Sunday, September 18, 2011 at 5:17pmsame question posted by Kate

http://www.jiskha.com/display.cgi?id=1316353131

- MATH -
**Audrey**, Sunday, September 18, 2011 at 5:22pmi still don't understand how you got that

- MATH -
**Reiny**, Sunday, September 18, 2011 at 5:54pmTo do these kind of problems, you must have studied the difference between permutations and combinations.

This is a a "combination" type question

You are choosing 2 out of 16 different items in the AFL

that would be C(16,2) = 16!/(14!2!) = 120

You have the same situtation for the other league.

so the number of ways to choose 2 teams from AFL, and 2 teams from NFC

= 120*120=14400

But obviously only one of these will be the correct final selection.

so prob = 1/14400

I really don't know how to explain it in any other way.

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