In a class of 55 students, the number of students studying differen...

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In a class of 55 students, the number of students studying different subjects are 23 in Mathematics, 24 in Physics,
\( \mathrm{P} \) 19 in Chemistry, 12 in Mathematics and Physics, 9 in
W. Mathematics and Chemistry, 7 in Physics and Chemistry and 4 in all the three subjects. The number of students who have taken exactly one subject is
(a) 6
(b) 9
(c) 7
(d) All of these
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