Permutations And Combinations

In an examination of Mathematics paper, there are 20 questions of equal marks and the question paper is divided into three sections : \(A, B\) and \(C\). A student is required to attempt total 15 questions taking at least 4 questions from each section. If section \(A\) has 8 questions, section \(B\) has 6 questions and section \(C\) has 6 questions, then the total number of ways a student can select 15 questions is __________.