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At a certain school each student must take at least one course Algebra (A), Biology (B) or Chemistry (C). 21 students take A; 22 students take B; 21 students take C 10 students take A and B; 7 students take A and C; 9 students e B and C 4 students take A, B and C. How many students are in the school?

At a certain school each student must take at least one course Algebra (A), Biology (B) or Chemistry (C). 21 students take A; 22 students take B; 21 students take C 10 students take A and B; 7 students take A and C; 9 students e B and C 4 students take A, B and C. How many students are in the school?

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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18. At a certain school each student must take at least one course in Algebra (A), Biology (B) or Chemistry (C). 21 students take A; 22 students take B; 21 students take C 10 students take A and B; 7 students take A and C; 9 students take B and C 4 students take A, B and C. How many students are in the school? 42 40 none of these 39
Transcribed Image Text:18. At a certain school each student must take at least one course in Algebra (A), Biology (B) or Chemistry (C). 21 students take A; 22 students take B; 21 students take C 10 students take A and B; 7 students take A and C; 9 students take B and C 4 students take A, B and C. How many students are in the school? 42 40 none of these 39
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