B) Show that the two probabilities of p.16 (Example 4) are equal (set them equal, expand the "choose"'s, cancel numerators and denominators till the two sides match up. You shouldn't have to actually multiply anything.)
Ash, p. 19:
1, 2
4 (like example 4)
5 (It's like the mosquitos. They mean "exactly"
3 W and 2R)
3 (harder? I think it's easier with an ordered
list of 3. After you've chosen the first person, who CAN'T you choose?)
6 Hint: let the people pick the seats.
10 Hints: 1) Will the probability be the
same whether i = 1, 2, or 3...?. . 2) I suggest doing it with i =
1, for 2 boys, 3 girls, then building up, 4 boys, 6 girls. Look for
a general approach.
11 Optional--read answers. I don't want
to put bad ideas in your head.
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