A group of 12 persons are available for use in a study. Four are to be selected to receive an experimental treatment, while the remaining persons will serve as the control group. In how many ways can the control group be composed?

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- March 28th 2014, 06:08 AMnycmath4C3 or 12C8?
A group of 12 persons are available for use in a study. Four are to be selected to receive an experimental treatment, while the remaining persons will serve as the control group. In how many ways can the control group be composed?

- March 28th 2014, 06:13 AMPlatoRe: 4C3 or 12C8?
- March 28th 2014, 06:33 AMnycmathRe: 4C3 or 12C8?
I subtracted the 4 people selected for the experimental group from 12. This left 8 to be selected for the control group.

I then said it must be 12C8.