Abox 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

Step-by-step explanation:

938/969 is right just took test got a 5/5

-6 is the correct option from the above given options

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value