+0  
 
0
70
4
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You have to divide a group of three girls and six boys into a group of four and a group of five. In how many ways can you do this?

 Feb 20, 2020
 #1
avatar+6180 
+1

\(\dbinom{9}{5} = \dbinom{9}{4} = 126\)

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 Feb 20, 2020
 #2
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+1

Hi! Thanks! I'm kind of confused though this isn't a fraction right? How does this mean 126?

Guest Feb 21, 2020
 #3
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0

I’m sure Rom will carefully explain this to you.

Guest Feb 21, 2020
 #4
avatar+108771 
+1

No it is combination maths. C for combination or C for choice

 

9C4 = 9C5     

The brackets that Rom used is just another way to display this.

There is a C function on any 'proper' calculator.

 

9C4 means how many different combinations of 4 items can I choose if I have 9 items altogether to choose from.

Melody  Feb 21, 2020

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