Asked by Anika

70 students are studying mathematics,physics & chemistry.40 students study mathematics,35 study physics and 30 study chemistry.15 students are studying all the three subjects.How many students are studying exactly two of the subjects
Answered by Steve
If there are a,b,c students studying exactly two of the subjects, taken in pairs, then

(40+35+30)-(a+15 + b+15 + c+15)+15 = 70
a+b+c = 5

So, 5 students are taking exactly two of the subjects.
Answered by rohith kp
In a class of 120 students each student studies at least one of the subjects from history English & maths 59 study history 67 study English & 73 study maths. 34 study maths & history, 26 english & maths & 33 history & english

How many students study exactly two subjects.?


Answered by Nazim
(M+P+C)-(M&P+P&C+M&C)+All=70
=> M&P+P&C+M&C = 40+35+30-70
=> M&P+P&C+M&C = 50
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