Collection of the following information from 20 family nearby your house
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Total number of families = u = 40
Number of families reading English paper = n(E) = 9
Number of families reading Marathi paper = n(M) = 20
Number of families reading both papers = n(E ∩ M) = 7
Total number of families reading news paper = n(E U M)
= n(E) + n(M) – n(E ∩ M)
n(E U M) = 9 + 20 – 7 = 22.
Total number of families = number of families reading at least one paper + number of families not reading any paper.
Hence we get number of families not reading any news paper = U – n(E U M) = 40 – 22 = 18.
Hence 18 families do not read any news paper.
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