Answer....

In a multiple-choice exam, you have an unlimited supply of questions, in which a correct answer fetches you 4 points a wrong answer has a penalty of 1 mark. If you randomly select one of the four options available for each question, what is the minimum number of questions you have to try to make sure you are 99 percent sure to get marks above 20? Select one: 556 None of these x 667 B34 I do not want to attempt