(a).n. (P) + n. (Q) = n(P-Q) + n(Q- N
1
5
7
10
4
6
4
7
9
(b) n( PUQ) = n(U) - n(PUQ)
(c) n. (P) + n. (Q) + n(PnQ) = n(PUQ)
12
3
9
11
13
15
14
3.(a) In a survey of a school, 300 students favour to play volleyball, 250 favou
cricket and 110 favour both of the games. Draw a Venn-diagram and calcu
i. the number of students who play cricket only:
the number of students who play either volleyball or cricket.
(b) In a survey, after their SEE, 190 students wanted to be an engineer, 160 v
be a doctor and 120 wanted to be both. If 300 students were interviewe
Venn-diagram and find the number of students who wanted to be r
them.
(C) In a survey of 120 adults, 88 drink cold drinks and 26 drink soft drink. If 1
drink neither of them, find out the number of adults who drink both
drink by using a Venn-diagram.
4.(a) In a survey of youths, it was found that 85% liked to do something in th
60% liked to go to foreign emloyment If 5% of thom