*Will fan and Medal*

A box contains 20 lightbulbs, of which 5 are defective.
If 4 lightbulbs are picked from the box randomly, the probability that at most 2 of them are defective is?

A) 31/969

B) 70/323

C) 91/323

D) 938/969

Question

*Will fan and Medal*

A box contains 20 lightbulbs, of which 5 are defective.
If 4 lightbulbs are picked from the box randomly, the probability that at most 2 of them are defective is?

A) 31/969

B) 70/323

C) 91/323

D) 938/969

bruhobamacare · Answer

D

princessaurora · Answer

Thanks, how did you get that answer?

bruhobamacare · Answer

http://tex.z-dn.net/?f=%5C%5C%7C%5COmega%7C%3D%7B20%5Cchoose4%7D%3D4845%0A%5C%5C%0A%5C%5C%7CA%7C%3D%7B15%5Cchoose4%7D%2B%7B15%5Cchoose3%7D%2A%7B5%5Cchoose1%7D%2B%7B15%5Cchoose2%7D%2A%7B5%5Cchoose2%7D%3D4690%0A%5C%5C%0A%5C%5CP%28A%29%3D%5Cfrac%7B4690%7D%7B4845%7D%3D%5Cfrac%7B938%7D%7B969%7D%0A%5C%5C%0A%5C%5CD.

bruhobamacare · Answer

look at the link plz .. it will explain :)

princessaurora · Answer

Ok I see, Thanks sooo much!!!

bruhobamacare · Answer

anytime :) glad I could help