A.) From a committee of 15 students, in how many ways can a sub-committee of 3 students be selected?

B.) From a committee of 15 students, in how many ways can a chairsperson and then a secretary be elected?

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- Sep 27th 2007, 04:21 PMMr_Greenstudents and sub committees
A.) From a committee of 15 students, in how many ways can a sub-committee of 3 students be selected?

B.) From a committee of 15 students, in how many ways can a chairsperson and then a secretary be elected? - Sep 27th 2007, 08:08 PMJhevon
we want to choose 3 people from a group of 15, so the answer is 15 choose 3, or $\displaystyle {15 \choose 3}$

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B.) From a committee of 15 students, in how many ways can a chairsperson and then a secretary be elected?