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      

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