Out of 100 students, 50 failed in English and 30 in Mathematics. If 12 students fail in both English and Mathematics. Then the number of students who passed in both the subjects is__________?
Q1. Out of 100 students, 50 failed in English and 30 in Mathematics. If 12 students fail in both English and Mathematics. Then the number of students who passed in both the subjects is__________?
Answer: 32
Explanation: By inclusion-exclusion, students failing in at least one subject = 50+30−12 = 68; students passing both = 100−68 = 32.