We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
45
2
avatar

Assuming that the birth of a boy or a girl is equally likely, what is the probability that the three children in a family include at least one boy and one girl? Express your answer as a common fraction.

 Nov 11, 2019
 #1
avatar+19773 
+2

I believe this has been answered before.....but I'll try anew:

1=boy  0=girl

possibities

111

110

101

011

100

010

001

000      6 out of 8 include at least 1 boy 1 girl    6/8 = 3/4

 Nov 11, 2019
 #2
avatar+105411 
+1

EP is correct

 

We have 2 * 2 * 2  =   2^3  =  8 possibilities

 

Only  two of these  are either all boys or all girls

 

So

 

[ 8 - 2  ] / 8   =

 

6 / 8  =

 

3 / 4

 

 

cool cool cool

CPhill  Nov 11, 2019

9 Online Users

avatar