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 2 years ago
Aysha has 8 pictures to hang over her couch. She wants to hang only 3 of them.
Find how many ways she can choose the 3 pictures from the 8
 2 years ago
Aysha has 8 pictures to hang over her couch. She wants to hang only 3 of them. Find how many ways she can choose the 3 pictures from the 8

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CliffSedge
 2 years ago
Best ResponseYou've already chosen the best response.08c3 if order doesn't matter.

CliffSedge
 2 years ago
Best ResponseYou've already chosen the best response.0Are you familiar with Pascal's Triange?

A.Avinash_Goutham
 2 years ago
Best ResponseYou've already chosen the best response.0u kno wat 8p3 is?

CliffSedge
 2 years ago
Best ResponseYou've already chosen the best response.0I'm pretty sure this is a combination and not a permutation.

A.Avinash_Goutham
 2 years ago
Best ResponseYou've already chosen the best response.0yup that's a combination nd it's 8c3

CliffSedge
 2 years ago
Best ResponseYou've already chosen the best response.0Can use either Pascal's Triangle or the formula with factorials. For n=8, probably better off using the formula.

CliffSedge
 2 years ago
Best ResponseYou've already chosen the best response.0nCx = n!/(x!(nx)!) I think that's it. I'm just pulling it from memory, so I might have it mixed up with the other one, but it looks right.

Wolfboy
 2 years ago
Best ResponseYou've already chosen the best response.0ok so how do we use this to make our equation. And sorry for the slowness i went surfing yesterday and i am still really tiered.

CliffSedge
 2 years ago
Best ResponseYou've already chosen the best response.0A quick drawing of Pascal's Triangle shows it's 56, and 8!(3!(83)!) = the same.

CliffSedge
 2 years ago
Best ResponseYou've already chosen the best response.0Do you know how to write out a factorial?

Wolfboy
 2 years ago
Best ResponseYou've already chosen the best response.0uh i probably do but dont remember can you show me again?

CliffSedge
 2 years ago
Best ResponseYou've already chosen the best response.0While I do that, do an internet search for "Pascal's Triangle."  It's useful not only for combinations, but also for finding the coefficients of an expanded power of a binomial.

CliffSedge
 2 years ago
Best ResponseYou've already chosen the best response.0n! = n*(n1)*(n2)*...*1 e.g. 8! = 8*7*6*5*4*3*2*1 dividing factorials is easy because so many common factors cancel out. e.g. 8!/3! = 8*7*6*5*4

Wolfboy
 2 years ago
Best ResponseYou've already chosen the best response.0Thanks for all of your help @CliffSedge
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