In a class of 120 student, 95 like Account subject, 80 like biology. If there are none who don't like both subject then:
a) Find the number of students who like account only.
b)find the number of students who like biology only .
Answers
Answered by
1
Answer:
40 people like only account and 25 people like only biology.
Answered by
2
Answer:
n(AuB)=n(A)+n(B)-n(AnB)
n(AuB)= union students who like biology,who like accounts and who like both there are no one who don't like both subjects
n(AuB)=120
120=95+80-n(AnB)
n(AnB)=175-120
n(AnB)=55
no of students who like both subjects are 55
no of students who like accounts only=95-55=40
no of students who like biology only=80-55=25
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