A test has 5 multiple-choice questions. Each question has 4 answer options (A, B, C, D).
What is the probability that a student will choose "B" for at least three questions if he/she leaves no questions blank?
1
1/1024
2
1/64
3
53/512
4
29/128
A test has 5 multiple-choice questions. Each question has 4 answer options (A, B, C, D).
What is the probability that a student will choose "B" for at least three questions if he/she leaves no questions blank?