An examination paper consists of 7 questions, 4 in part A and 3 in part B. A student has to attempt 5 questions in all, such that he should select at least 2 from each part.In how many number of ways it can be done ?

• 3 questions in Part A & 2 questions in Part B are selected = 4c3*3c2 ways
  2 questions in Part A & 3 questions in Part B are selected = 4c2*3c3 ways
  5 questions in all, such that he should select at least 2 from each part is = 4c3*3c2 + 4c2*3c3
  = 4*3+6*1 = 12+6 = 18 ways
• 12 years agoHelpfull: Yes(1) No(0)