a) A speaker\'s table has 10 chairs in a row of the 10 people to be sealed 4 are
ID: 3226302 • Letter: A
Question
a) A speaker's table has 10 chairs in a row of the 10 people to be sealed 4 are left-handed and 6 are right-handed. To avoid elbowing each other while eating, the left-handed people are sealed in the 4 chairs on the left. In how many ways can these 10 people be sealed? b) A department in a company has 12 members: 8 males and 4 females. To gain greater insight into the employees' views of certain benefits, the human resources department plans to form a focus group from members of this department: Five department members will be selected at random from the department's members (i) What is the probability that the focus group will have only males? (ii) What is the probability that the focus group will have two males and three females?Explanation / Answer
answer A
the possibel ways to avoid elbowing each other is
left,right
left,left
right,right
(l)(l)(l)(l)/....(r)(r)(r)(r)(r)(r)
4!*6!=24*720
=17280 ways
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