Instructions

In the following questions are to be based on the details given below:
A salesman visits 274 houses in a town to fmd out the views about three products X, Y and Z. He found that 157 use X, 98 use only X, 22 use all the three, 14 use X and Z but not Y, 39 use Y and Z., 48 use only Y

Question 27

How many use product Z only?

Solution

Z = Total -X-Y -(X AND Z) - (X and Y) - (X and Y)

z = (274 -98-48-14-39-23) = 52

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How many use product Z only?

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