Chinese Students Have To Solve This Question For Wi-Fi Password

When the students try to solve the questions in some different way as taught by the teacher from prescribed books ,then these students should be :

What is the use of WI-Fi?

A question paper has two sections. section I has 5 questions and section II has 6 questions. A student must answer at least two question from each among 6 questions he answers. How many different coices does the student have in choosing question?

A question paper has 6 questions. How many ways does a student have to answer if he wants to solve at least one question?

The probabilities that a student will solve Question A and Question B are 0.4 and 0.5 respectively. What is the probability that he solves at least one of the two questions ?