missing information.
In what way are the sibling choices affecting the casting?
e.g. can the 2 siblings not be cast together?
Of the 7 males and 5 females, there are two sets of siblings. One set consists of a brother and sister, and the other set consists of a brother and his 2 sisters. The lead roles are cast randomly.
B. What is the probability that a pair of siblings are cast in the lead roles?
I don't get this probability question.
wouldn't you have to add the 2 # s so it'll be 1/12 too??
3 answers
I'm still not understanding what you mean. So the siblings can be casted together because there are 7 males and 5 females and 2 sets of siblings could potentially have those roles.So how should I write the probability?
ok, I misread your question
total number of castings = 35
number of casting with the one brother and sister = 1
number of castings with the one brother and two sisters = 1 x 2 = 2
prob (bother and sister in casting) = 3/35
total number of castings = 35
number of casting with the one brother and sister = 1
number of castings with the one brother and two sisters = 1 x 2 = 2
prob (bother and sister in casting) = 3/35