Homework Help: Math

Posted by Maria on Wednesday, January 30, 2013 at 12:20am.

2. Three members of a 12 person singing group are going to be chosen to sing a song in their coming concert.

A) how many different groups containing 3 people can be chosen from the 12 members of the singing group?

B) what Is the probability that mike and Jo will both be in the selected group?

Math - Jennifer, Thursday, January 31, 2013 at 8:45pm
A) 12 choose 3, calculated as

12! / (3! * 9!) = 12*11*10 / (3*2)

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