Asked by Keonn'a
How many two-person committees can be selected from a set of 8 people.
8nCr2=28
I need a reason why it is 28 when you input it into the calculator
8nCr2=28
I need a reason why it is 28 when you input it into the calculator
Answers
Answered by
scott
you are filling two slots ... 8 people for the 1st, and 7 people for the second
... 8 * 7 = 56
BUT ... Joe and Sue on the committee is the same as Sue and Joe
... order is not important
so there are 56/2 ways to select the committee
... 8 * 7 = 56
BUT ... Joe and Sue on the committee is the same as Sue and Joe
... order is not important
so there are 56/2 ways to select the committee