Answer: 0.11
Explanation:
There are 20 AAA batteries in a box and 7 are defective. If two batteries are selected without replacement, the probability of selecting a defective battery will be 7/20.
The probability of selecting another defective battery will be 6/19 as there will be 19 batteries left and 6 defective.
Then, the probability of selecting a defective battery followed by another defective battery will be:
= 7/20 × 6/19
= 42/380
= 0.11
