TS EAMCET 9-Sep-2020 Shift 2 Solved Paper

Let x denote the number of ways of selecting at least one ball from a bag containing 3 identical red balls, 4 identical blue balls and 5 identical green balls. Let y denote the number of ways in which a student will fail in an examination, when he has to write the examination in 5 different subjects. Then x+y=