Section: Math Section 3

58) A test shows that 10 out of 100 gadgets are defective. In a random sample of two gadgets are chosen, the probability that both are defective it is:

1. 1/1000
2. 1/110
3. 1/11
4. 1/10
5. 1/5

The probability that the first gadget is defective is 10/100, and the probability that the second gadget is defective is 9/99. To solve this you must multiply the two fractions.