How To Solve 5 Marks Question On Federalism

How many policies does the Institutional Mechanism of Federalism accommodate?

In an examination, the probability of a candidate solving a questions is (1)/(2) Out of given 5 question in the examination, what is the probability that the candidate was able to solve at least 2 questions?

There are three section A,B, C in a paper each section having 5 questions . In how many ways a student can solve exactly 5 questions taken at least one question from each section.