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There are 10 aaa batteries in a box and 3 are defective. two batteries are selected without replacement. what is the probability of selecting a defective battery followed by another defective battery?

Respuesta :

Thank you for posting your question here at brainly. I hope the answer will help. The probability of selecting a defective battery followed by another defective battery is  1/30. Below is the solution.

Solution:

Probability of Defective batteries = 3/20 x 2/9 = 6/180 or 1/30

Answer:

The required probability is 1 / 15.

Explanation:

out of 3 defective batteries we can select two  defective batteries in 3 ways  (3C2).  

Total no of possible combination is( 10C2) =  (10 x 9) / 2 = 45.

So required probability is  =  3 / 45 = 1 / 15.