In a class, all pupils take Mathematics (M), 18 take Chemistry (C), 17 take Biology (B) and
24 take Physics (P) of those taking 3 subjects only, 5 take Physics and Chemistry, 7 take Physics
and Biology and 6 take Chemistry and Biology. Only two pupils take all the four subjects.
Draw a Venn diagram and use it to find how many pupils take neither Physics nor Chemistry.