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A group consists of five men and seven women. four people are selected to attend a conference.
a. in how many ways can four people be selected from this group of twelve​?
b. in how many ways can four women be selected from the seven ​women?
c. find the probability that the selected group will consist of all women.0

Respuesta :

a.  That would be 12C4    = (12*11*10*9) / (4*3*2*1)  =   495 ways

b.   This is 7C4 = 7C3  = (7*6*5) / 6  = 35 ways

c.  This would come to 7C4 / 12C4  =  35/495 =  7/99

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