Posted by Maria on Wednesday, January 30, 2013 at 3:29pm.
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 (probability)  bobpursley, Wednesday, January 30, 2013 at 3:38pm
b. three choices
?MJ
?JM
J?M
JM?
MJ?
M?J so there are six ways to get it, so probability is 6*(1/12*1/11*10/10)
a. 3!/12!9!

Math (probability)  bobpursley, Wednesday, January 30, 2013 at 3:40pm
oops a. 12!/(3!9!)=12*11*10/6=11*10*2
check that
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