Question

A bag contains a total of 9 batteries, of which 5 are defective. Selecting two at randon, without replacement, determine the probability that none of the batteries you select are good.
Would it be 2/9?

Answer 1

how is it 2/9?

Answer 2

you're looking for the probability that both are defective right?

Answer 3

determine probability that none of the bateries you select are good

Answer 4

yes...that means you're looking for a probability you drew are bad...hence defective..

Answer 5

ya

Answer 6

ya i know

Answer 7

probability you draw a defective on first draw is 5/9

then probability you'll draw another defective is 4/8 (because there's no replacement)

now multiply the two to get the overall probability

5/9 x 4/8

Answer 8

so what did you do?

Answer 9

im not sure but what ur saying makes sense

Answer 10

thanks!

Answer 11

welcome