# Suppose that you take a 20 question multiple-choice quiz by guessing. Each question has exactly one correct answer of the four alternatives given. What is the probability of getting all 20 questions incorrectly?

##### 1 Answer

Jul 18, 2017

All wrong:

All right:

#### Explanation:

For each question, there are 3 incorrect answers and 1 correct answer. Each question is a separate event and so we multiply the probabilities.

**All answers wrong**

That's

**All answers right**