In a certain examination, 72 candidates offered Mathematics, 64 offered English, and 62 French. 18 offered both Mathematics and English, 24 Mathematics and French and 20 English and French. 8 candidates offered all the three subjects. How many candidates were there for the examination?
Q. In a certain examination, 72 candidates offered Mathematics, 64 offered English, and 62 French. 18 offered both Mathematics and English, 24 Mathematics and French and 20 English and French. 8 candidates offered all the three subjects. How many candidates were there for the examination?
Denote Candidates and Subjects: Let's denote the number of candidates who offered Mathematics as M, English as E, and French as F. According to the problem, we have:M=72E=64F=62The number of candidates who offered both Mathematics and English is M∩E=18, both Mathematics and French is M∩F=24, and both English and French is E∩F=20. The number of candidates who offered all three subjects is M∩E∩F=8.We will use the principle of inclusion-exclusion to find the total number of candidates (E0). The formula is:E1
Apply Inclusion-Exclusion Principle: Now let's plug in the values we have into the formula:N=72+64+62−(18+24+20)+8
Calculate Total Number: Perform the calculations inside the parentheses first:N=72+64+62−62+8
Calculate Total Number: Perform the calculations inside the parentheses first:N=72+64+62−62+8Now, simplify the expression by adding and subtracting the numbers:N=72+64+8N=144