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A researcher needs to split 26 plants into two treatment groups of 13 plants each. How many different groupings can be formed?

 May 19, 2021
 #1
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I think it is just    26 C 13    =   26! / (  13! 13!)

 May 19, 2021
 #2
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Guest would be right if the groups were distinct, but if they are indistiguishable it would be half that or \(\frac{\binom{26}{13}}{2}\)

 May 19, 2021

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