Mathematics for IGCSE & O level - Sets (Section 3 - No. 36)
In a class of 40 students, 20 study physics, 18 study chemistry, and 8 study both. How many students study neither physics nor chemistry?
10
12
14
22
คำอธิบาย
Students studying either subject: 20 + 18 - 8 = 30. Students studying neither = 40 - 30 = 10.