Posted by nitz on .
a couple is planning to have three children. Find the probability that the couple will have:
a.) 2 girls and 1 boy?
b.) 2 girls followed by a boy?
c.) at least 1 girl?
please answer my question thank you very much, have a good day!

probability 
Reiny,
There are 8 ways to have B G
a)2 girls and 1 boy > GGB GBG BGG
Prob = 3/8
b) 2 girls followed by boy >GGB
prob = 1/8
c) at least one girl, means exclude BBB
prob = 1  1/8 = 7/8