Multiple choice Find the number of ways in which 9 students can be equally divided into three groups? 280 360 200 540 None of these Reveal answer Fill a bubble to check yourself A Correct answer Explanation Select 3 out of 9, then 3 out of remaining 6: C(9,3) × C(6,3) = 84 × 20 = 1680. Since groups are identical, divide by 3! = 6, giving 1680/6 = 280.