An exam paper consists of 30 questions, 15 in group A, 10 in group B and 5 in group C. Exactly 7 questions from the first, 5 from the second and 3 front he third group must be answered. These can be selected by the student. How many different ways are there to do the exam , if the order in which the questions are answered is unimportant?

Question

anonymous · Answer

Using combination formula, http://www.mathwords.com/c/combination_formula.htm (15C7)*(10C5)*(5C3) =16216200