Posted by **Anonymous** on Wednesday, March 10, 2010 at 8:03am.

A cooking recipe lists 6 ingredients which must be mixed in the correct order. Unfortunately the bottom of the page on which the correct order was given has been burnt off. Suppose that you make a guess at the correct order. What is the probabilty that you will be right?

Please help, I have no clue how to do this! Thanks!

- probability -
**Reiny**, Wednesday, March 10, 2010 at 8:22am
Since the order matters, there are 6 different ingredients that could be used first.

Then there would be 5 remaining ingredients that could be used second.

Then there would be 4 remaining .... etc.

Number of ways = 6x5x4x3x2x1 = 720

(A string of consecutive multiplications such as 6x5x4x3x2x1 is called

6 factorial or 6!

Most calculators have a key called

n!

on mine, I press 6, then 2ndF n! )

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