Question 406734
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Hi
A box containing twelve 40-watt light bulbs and eighteen 60-watt light bulbs 
is stored in your basement . Unfortunately, the box is store in the dark and
 you need two 60-watt bulbs. What is the probability of randomly selecting a 
40-watt bulb given that you have selected a 60-watt bulb?

 30 bulbs of which 12 are 40-wattt and 18 are 60-watt
P(choosing a  40, having chosen a 60) = 12/29