Must Try HCV Questions

"She must try him understand". Find the improvement in the above sentence ?

A student is to answer 10 out of 13 questions in an examination such that he must choose at least 4 from the first five questions.The number of choices available to him is

A student is to answer 10 out of 13 questions in an examination such that the he must choose t least 4 from the first five questions. The number of choices available to him are (A) 346 (B) 140 (C) 196 (D) 280

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 :

In which tests must you answer as many questions as you can in a certain amount of time