anonymous
  • anonymous
How many groups of four shirts can you choose from six shirts? Determine if the word problem is a permutation or a combination, then evaluate. Which question below is a permutation? How many different teams of four runners can a coach choose from a group of seven runners? You and three friends want to line up next to one another for a picture. How many ways can the picture be taken? You want to choose three pairs of shorts from five to go on vacation. How many groups of three pairs of shorts can you choose? How many groups of five movies can be chosen from 11?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
@isaac4321
welshfella
  • welshfella
combinations of 4 from 6 = 6C2
anonymous
  • anonymous
?

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welshfella
  • welshfella
have you seen that notation before 6C2?
welshfella
  • welshfella
- thats the answer to the first question about shirts
welshfella
  • welshfella
6C2 is equivalent to 6C4
anonymous
  • anonymous
\[_{n}C _{r} = \frac{ n! }{ r!\left( n-r \right)! }\]\[_{6}C _{2} = \frac{ 6! }{ 2!\left( 4! \right) }\]
anonymous
  • anonymous
its asking for a number not a 6C2 lol im confused
welshfella
  • welshfella
yes osprey has the formula a short way of working it out is 6*5 --- 2*1
welshfella
  • welshfella
- starting with 6 then going down to 5 because of the 2 6C4 = 6*5*4*3 ------ 4*3*2*1 which works out to the same value
welshfella
  • welshfella
6C2 means the number of combinations of 2 from 6
welshfella
  • welshfella
so for the first part its 6*5 / 2*1 = 15
anonymous
  • anonymous
ohhh
anonymous
  • anonymous
thank you
welshfella
  • welshfella
yw The difference between combinations and permutations is that the order does not matter in combinations. The groups of 4 shirts can be in any order.
welshfella
  • welshfella
Now for the second part there is one in which the order matters which do you think it is?
anonymous
  • anonymous
is d correct for 2
welshfella
  • welshfella
No - in which one do you have a different result if there is a different arrangement?
welshfella
  • welshfella
Hint: Click
anonymous
  • anonymous
b
welshfella
  • welshfella
lol yes
welshfella
  • welshfella
different arrangement - different picture
anonymous
  • anonymous
thanx
welshfella
  • welshfella
get it now? i think you do yw

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