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October 20, 2014

October 20, 2014

Posted by **Dylan** on Wednesday, December 19, 2007 at 7:45am.

If Jon, Mac, and Heather are taking a group photo, how many different ways can the photographer line them up? .. okay, I have that one .. = 6 ... but now i have to add 3 more people and try to figure out how many ways can all of these together (6 of them)be lined up .... is there a formula i a could I use instead of writing all the different combinations? .. thank you for your help!

- Math -
**bobpursley**, Wednesday, December 19, 2007 at 8:41amWouldn't it be six factorial?

- Math -
**Dylan**, Wednesday, December 19, 2007 at 8:45amYes, i understand that but can't figure out with what or how many different ways ..

- Math -
- Math -
**Reiny**, Wednesday, December 19, 2007 at 9:28amThink of it as filling three spots with the three different people.

You can place one of 3 different people in the first spot.

Now look at the second spot, since one of the people has been placed, that would leave one of the remaining two people to be placed in that spot

So far you have 3*2 ways.

Finally since there is only one person left to placed in the last spot,

your calculations is 3*2*1 or 6 ways.

- Math -
**Reiny**, Wednesday, December 19, 2007 at 9:30amcontinued....

so if you had 6 people, repeat the thinking process and you have, as bobpursely told you,

6*5*4*3*2*1 = 6! = 720

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