Pulsified333
  • Pulsified333
For this problem, assume 9 males audition, one of them being George, 6 females audition, one of them being Jackie, and 5 children audition. The casting director has 3 male roles available, 1 female role available, and 2 child roles available. How many different ways can these roles be filled if exactly one of George and Jackie gets a part?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Pulsified333
  • Pulsified333
@jim_thompson5910 @satellite73 @dan815
jim_thompson5910
  • jim_thompson5910
`if exactly one of George and Jackie gets a part` so they mean just one of them? either George OR Jackie? The wording they have is a bit odd
Pulsified333
  • Pulsified333
yes, i know the wording is odd

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jim_thompson5910
  • jim_thompson5910
I'm going to assume they meant to say George OR Jackie (exactly one person) gets the role. So it's not possible for both to get the role
jim_thompson5910
  • jim_thompson5910
`9 males audition` `3 male roles available` Let's say George is locked in to get a role. So we really have 3-1 = 2 slots left for the male roles. This is from a pool of 9-1 = 8 males how many ways are there to fill 2 slots from a pool of 8 males?
Pulsified333
  • Pulsified333
ok
Pulsified333
  • Pulsified333
56
jim_thompson5910
  • jim_thompson5910
order doesn't matter. So you divide 56 by 2 to get 28
Pulsified333
  • Pulsified333
okay but isnt it possible to have any of the three roles
jim_thompson5910
  • jim_thompson5910
I guess it depends on what the roles are. Are they important roles or extras? Hmm I'm not sure
jim_thompson5910
  • jim_thompson5910
if the roles are important (eg: leading roles), then order would matter since the characters are different
Pulsified333
  • Pulsified333
so then how do we account for the three roles he could play
jim_thompson5910
  • jim_thompson5910
I'm not sure now because I'm not sure what the roles are. So I don't know if order matters or not
jim_thompson5910
  • jim_thompson5910
Sorry I'm not really helpful with this one
Pulsified333
  • Pulsified333
well i have 4 attempts so lets do it with three separate roles on this
jim_thompson5910
  • jim_thompson5910
ok well if order did matter, then George could have male role A, male role B, male role C he has 3 choices if he picks male role A, then there are 8*7 = 56 ways to fill up the other 2 male roles if he picks male role B, then there are 8*7 = 56 ways to fill up the other 2 male roles if he picks male role C, then there are 8*7 = 56 ways to fill up the other 2 male roles as a shortcut, there are 3*56 = 168 ways to fill up the male roles assuming George gets a male role and order matters (the roles are important roles)
Pulsified333
  • Pulsified333
ok
jim_thompson5910
  • jim_thompson5910
how many ways are there to fill the female role? We're still under the assumption George got the role. So Jackie can't get the role if George did.
Pulsified333
  • Pulsified333
there is only 1 way if jackie gets the role
jim_thompson5910
  • jim_thompson5910
like I said ` We're still under the assumption George got the role. So Jackie can't get the role if George did.`
Pulsified333
  • Pulsified333
so what would the answer be
Pulsified333
  • Pulsified333
168?
jim_thompson5910
  • jim_thompson5910
we're not there yet how many ways are there to fill the female role? assume that Jackie can't get the role
Pulsified333
  • Pulsified333
6
jim_thompson5910
  • jim_thompson5910
jackie can't get the role though 6-1 = 5 so it's 5 actually
Pulsified333
  • Pulsified333
ah that makes sense
jim_thompson5910
  • jim_thompson5910
` 5 children audition` `2 child roles available.` how many ways to fill up these slots?
Pulsified333
  • Pulsified333
20
jim_thompson5910
  • jim_thompson5910
good
Pulsified333
  • Pulsified333
168*5*20 = 16800
jim_thompson5910
  • jim_thompson5910
summary so far IF george gets a role, then there are... 168 ways to fill up the male roles 5 ways to fill up the female role 20 ways to fill up the child roles
jim_thompson5910
  • jim_thompson5910
yes you beat me to it, you multiply those values out
jim_thompson5910
  • jim_thompson5910
that's just half the answer though
Pulsified333
  • Pulsified333
oh
jim_thompson5910
  • jim_thompson5910
we haven't considered the scenario that Jackie gets the role
jim_thompson5910
  • jim_thompson5910
give it a shot and tell me what you get
Pulsified333
  • Pulsified333
10080 if jackie gets the role
Pulsified333
  • Pulsified333
do we subtract them or add them together?
jim_thompson5910
  • jim_thompson5910
once again, if either Jackie or George gets the role, then the other person can't get it so we're now assuming Jackie gets the role. So george did NOT get the role. Try again
jim_thompson5910
  • jim_thompson5910
if george did NOT get the role, then the pool of 9 males drops to 8
Pulsified333
  • Pulsified333
sorry 6720
jim_thompson5910
  • jim_thompson5910
better
jim_thompson5910
  • jim_thompson5910
we have 2 cases George gets the role: 16800 different ways Jackie gets the role: 6720 different ways add them up
Pulsified333
  • Pulsified333
okay so that is 23520
jim_thompson5910
  • jim_thompson5910
yes
jim_thompson5910
  • jim_thompson5910
which is the final answer. It's the number of ways to pick all of the cast based on those specific conditions
Pulsified333
  • Pulsified333
it was the correct answer
Pulsified333
  • Pulsified333
:D
Pulsified333
  • Pulsified333
thanks man
jim_thompson5910
  • jim_thompson5910
ok so it was a lucky guess on our part to assume order mattered
jim_thompson5910
  • jim_thompson5910
no problem

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