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A survey of 120 households in a village found that 70 engage in homestay business, 50 in agriculture, and 30 do neither. How many households engage in both?

Mathematics

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यहाँ दिइएको जानकारी अनुसार, हामीले निम्न कुराहरू पत्ता लगाउन सक्छौं:
कुल घरधुरी N=120N = 120
होमस्टे व्यवसाय गर्ने घरधुरी n(H)=70n(H) = 70
कृषि व्यवसाय गर्ने घरधुरी n(A)=50n(A) = 50
अन्य काम गर्ने घरधुरी n(H∪A)′=30n(H \cup A)' = 30

Step 1: n(H∪A)n(H \cup A) र n(H∩A)n(H \cap A) पत्ता लगाउने।
हामीलाई थाहा छ, कुल घरधुरी भनेको कम्तिमा एउटा व्यवसाय गर्ने र कुनै पनि व्यवसाय नगर्ने घरधुरीको योगफल हो:

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