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In a library 25 students read physics, chemistry and mathematics books. It was found that 15 students read mathematics, 12 students read physics while 11 students read chemistry. 5 students read both mathematics and chemistry, 9 students read physics and mathematics. 4 students read physics and chemistry and 3 students read all three subject books.
(i) Atleast one $=11+9+5+4-2(3)$
$
=29-6=23
$
$
\Rightarrow \text { None }=25-23=2
$
(ii) The number of students who reading atleast one of the subject is 23 .
(iii)Only maths $=15-9-5+3=4$
Only physics $=12-9-4+3=2$
Only chemistry $=5 \Rightarrow$ Total $=11$
(iv)The number of students who reading only mathematics is 4 .
(i) Atleast one $=11+9+5+4-2(3)$
$
=29-6=23
$
$
\Rightarrow \text { None }=25-23=2
$
(ii) The number of students who reading atleast one of the subject is 23 .
(iii)Only maths $=15-9-5+3=4$
Only physics $=12-9-4+3=2$
Only chemistry $=5 \Rightarrow$ Total $=11$
(iv)The number of students who reading only mathematics is 4 .
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