1.

In a survey of 100 persons, it was found that 28 read magazine A, 30 read magazine B, 42 read magazine C, 8 read magazines A and B, 10 read magazines A and C, 5 read magazines B and C and 3 read all the three magazines. Find: How many read magazine C only?

Answer»

n(C) = 42 –(7+3+2) 

= 42–12. 

= 30



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