Question

In an exam total 15 questions are asked. You have to give answer of any 12 questions. Questions are divided in 3 sections. Each section contains 5 questions. You have to solve at least 3 questions from each section. How many methods are possible to give answers of all 12 questions.

Answer 1

First answer 3 question from first then answer 4 question from second and then 5 question from third section