On a multiple choice examination with three,possible answers for each of the five questions,what is the probability that a candidate would get four or more correct answers just bu guessing?

In an entrance examinations there are multiple choice question. There are five possible answers to each question of which one is correct. The probability that a student knows the answer to a question is 80%. IF he gets the correct answer to the question, then the probability that he was guessing is

In an entrance test, there are multiple choice questions. There are four possible answers to each question, of which one is correct. The probability that a student knows the answer to a question is 90%. If he gets the correct answer to a question, then find the probability that he was guessing.

Write the correct alternative answer for each of the following question: What is the degree of the polynomial?

Choose the correct alternative answer for each of the following question. What is the ratio of 1m to 1 cm?