There is one error in one of five blocks of a program. To find the error, we test three randomly selected blocks. What is the probability of finding the error.

Question

anonymous · Answer

assuming random means it is possible to repeat the same choice, (1/5)^3 or 1/125 or .008

anonymous · Answer

The three blocks are picked at the same time.

anonymous · Answer

There are 5C3 different outcomes = 10
To miss the error, you need to pick 3 non error blocks from 4 so 4C3 = 4
To not miss the error, means you need to pick it and 2 other block from 4 so 4C2 = 6

Answer 0.6. Can anyone confirm?

zarkon · Answer

.6 is correct