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March 31, 2015

March 31, 2015

Posted by **Punkie** on Wednesday, November 18, 2009 at 5:32pm.

a. Both are boys.

b. The first is a girl and the second a boy.

c. Neither is a girl.

d. At least one is a girl.

I was wondering about the formula....

is a. P(probability) = 1/2(boy) + 1/2(boy)

P = 1/2 + 1/2

so P = 2/2

to me this doesn't seem right

- Math -
**bobpursley**, Wednesday, November 18, 2009 at 5:48pmA) PR(B,B)=Pr(b)*Pr(b)=1/2*1/2

B) Pr(g)Pr(b)=1/2*1/2

C) you can get at least one girl these ways:

gb

bg

gg

Pr(at least one g)= 1/2*1/2*3

- Math -
**Punkie**, Wednesday, November 18, 2009 at 5:50pmThank you for answering my question.

Why do you multiply the probability of both boys, girl and boy, etc?

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