youngltnfun23
New member
A box is filled with 9 light bulbs of which 4 are defective. All the bulbs look alike and have an equal probability of being defective. If 5 bulbs are chosen and placed in a box, what is the probability that 2 of the light bulbs are defective?
I get as far as what would happen if 4 of them were defective... and then I get stuck. Anyone know how to get to the solution?
I get as far as what would happen if 4 of them were defective... and then I get stuck. Anyone know how to get to the solution?