How to solve pully questions in easy way

There are three sections in a question paper, each containing 5 questions. A candidate has to solve any 5 questions, choosing at least one from each section. Find the number of ways in which the candidate can choose the questions.

Akriti solved 10 questions of an exercise of 40 questions. Radhika solved 2/(5) of the same exercise. Who had solved more questions and by how many?

In how many ways can a ten question multiple choice examination be answered if there are four choices a, b, c and d to each question? If no two consecutive questions are answered the same way, how many ways are there?

Laura can solve 6 math questions in 12 minutes. Working at the same rate, how many minutes would it take Laura to solve 5 math questions?

A student has to answer 10 questions, choosing at least 4 from each of part A and B. If there are 6 questions in part A and 7 in part B. In how many ways can the student choose 10 questions?

A question paper consists of two sections having respectively, 3 and 5 questions. The followinng note is given on the paper "it is not necessory to attempt all the questions one questions from each section is compulsory". In how many ways can candidate select the questions?

A mathematics paper consists of 10 questions divided into two parts I and II each part containing 5 questions. A student is required to attempt 6 questions in al, taking at least 2 questions from each part. In how many ways can student select the questions?

There are 3 parts A,B and C in a question paper of Math's, which includes 6,7 and 8 questions respectivelty. From these parts 3,4 and 5 questions respectively are to be solved. In how many ways can a student select the questions from these parts?

In how many ways in which an examiner can assign 30 marks to 8 questions, giving not less than 2 marks to any question.

There are 60 questions in a question paper. If no two students solve the same combination of questions but solve equal number of questions, then the maximum number of student who appeared in the examination, is