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Read the following data and then answer the question that follow.
In a survey conducted among 200 mobile phone using families, it was found that 140 use Panasonic, 120 use Nokia and 143 use Siemens. 95 use both Panasonic and Nokia, 85 use both Nokia and Siemens and 93 use both Panasonic and Siemens. 70 families use mobile phones of all the three companies.
How many families use none of the mobile phones

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Cannot be determined

answer is C.

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Detailed Solution

Totol = 200

140 $\to$ Panasonic

120 $\to$ Nokia

143 $\to$ Siemens

95 $\to$ Use both Panasonic & Nokia

85 $\to$ Both Nokia & Siemens

93 $\to$ Both Panasonic & Siemens

70 $\to$ All three companies

How many use none of the Mobile phones 0 (Zero)

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