Question 870508: From a batch of 500 light bulbs, how many ways can three be tested to see if they are defective?
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! If order mattered, then there are 500*499*498 = 124,251,000 ways to test 3 lightbulbs (from a batch of 500).
Since order does not matter, we divide by 3! = 3*2*1 = 6 to get 124,251,000/6 = 20,708,500
=================================================================================
Final Answer: There are 20,708,500 different ways to test 3 light bulbs (from a pool of 500). Order does not matter.
|
|
|
