Question

A bag contains a total of 20 batteries, of which six are defective. Selecting two at random, without replacement, determine the probability that ONE of the batteries you select are good.

Answer 1

I know that for two good batteries, it's 16C2/20C2

Answer 2

(For 4 batteries that is)

Answer 3

(14C1 * 6C1) /20C2 + (6C1 * 14C1)/20C2

Answer 4

Can you just multiply 14C1 * 6C1 / 20C2 by two then?

Answer 5

yes.

It was for explanation.

Answer 6

Thank you

Answer 7

By the way, your answer was not correct. It's simply the first part, and not x2