In a survey of 120 adult , 88 drink cold drink and 26 drink soft drink. If 17 of them drink neither of them, findout the number
2 answers:
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Not much can be done without knowing what 
is, but at the least we can set up the integral.
First parameterize the pieces of the contour:
where
and 
. You have
and so the work is given by the integral
First parameterize the pieces of the contour:
where
and so the work is given by the integral