Advanced Math Question

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Let A be the number of students who attended the off campus party at the private residence

Let B be the number of students who ate at the restaurant with indoor seating. 

Therefore, nAB=nA+nB-nAB

total 90 students were surveyed, out of which 10 were unable to partake in either of these activities 

therefore,

nAB=90-10=80

nAB=nA+nB-nAB80=40+65-nAB80-40-65=-nAB-30=-nABnAB=30

 

 

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