In a cohort of 50 students, 30 study Biology, 25 study Chemistry, and 12 study both subjects. How many students study neither subject?
Answer and explanation
Correct answer: A. 7
- Step 1: Use the union formula: . Step 2. Subtract from total students: . Answer: 7. Why not the others: 5 ignores subtracting the intersection; 10 overestimates.
Practise more Number, Numeration, Sets, Sequences and Algebra.
Free questions with an explanation for every one, and full timed Unified Tertiary Matriculation Examination mock tests.