Solution to Suppose among 32 people who save paper or bottles (or both) for recycling, there are … - Sikademy
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Archangel Macsika

Suppose among 32 people who save paper or bottles (or both) for recycling, there are 30 who save paper and 14 who save bottles. Find the number m of people who: (a) save both; (b) save only paper; (c) save only bottles.

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Here's the Solution to this Question

(a)

N(P\cap B)=30+14-32=12

(b)

N(only\ P)=N(P)-N(P\cap B)=30-12=18

(c)

N(only\ B)=N(B)-N(P\cap B)=14-12=2

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