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Which of the following questions involves the concept of sets and Venn diagrams?

Mathematics

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Answer

b

9\text{9}

Step-by-step solution

7 steps

यहाँ दिइएको भेन-चित्रको आधारमा हामी प्रश्न 2 को समाधान गर्नेछौं।

भेन-चित्रबाट:
A={10,11,12,13}A = \{10, 11, 12, 13\}
B={11,12,14,15}B = \{11, 12, 14, 15\}
C={13,14,16}C = \{13, 14, 16\}
U={9,10,11,12,13,14,15,16,17}U = \{9, 10, 11, 12, 13, 14, 15, 16, 17\}

Part a· 2 steps

A,BA, B र CC कस्ता समूहहरू हुन्?

  1. समूहहरू बीचको साझा तत्वहरू पत्ता लगाउनुहोस्।

    A∩B={11,12}A \cap B = \{11, 12\}
    A∩C={13}A \cap C = \{13\}
    B∩C={14}B \cap C = \{14\}

  2. साझा तत्वहरू छन् वा छैनन् भनी निर्धारण गर्नुहोस्।

    सबै समूहहरू बीच साझा तत्वहरू छन् (A∩B≠∅A \cap B \neq \emptyset, A∩C≠∅A \cap C \neq \emptyset, B∩C≠∅B \cap C \neq \emptyset)।
    तसर्थ, A,BA, B र CC ओभरल्यापिङ समूहहरू (overlapping sets) हुन्।

Part b

9\text{9}

सर्वव्यापक समूह UU को गणनात्मक सङ्ख्या कति हो?

  1. भेन-चित्रमा भएका सबै अद्वितीय तत्वहरू गणना गर्नुहोस्।

    U={9,10,11,12,13,14,15,16,17}U = \{9, 10, 11, 12, 13, 14, 15, 16, 17\}

  2. तत्वहरूको सङ्ख्या पत्ता लगाउनुहोस्।

    n(U)=9n(U) = \boxed{\text{9}}

Part c· 3 steps

भेनचित्रको आधारमा n(A∪B)=n(A)+n(B)−n(A∩B)n(A \cup B) = n(A) + n(B) - n(A \cap B) देखाउनुहोस्।

  1. भेन-चित्रबाट n(A)n(A), n(B)n(B), n(A∩B)n(A \cap B) र n(A∪B)n(A \cup B) को मानहरू पत्ता लगाउनुहोस्।

    A={10,11,12,13}  ⟹  n(A)=4A = \{10, 11, 12, 13\} \implies n(A) = 4
    B={11,12,14,15}  ⟹  n(B)=4B = \{11, 12, 14, 15\} \implies n(B) = 4
    A∩B={11,12}  ⟹  n(A∩B)=2A \cap B = \{11, 12\} \implies n(A \cap B) = 2
    A∪B={10,11,12,13,14,15}  ⟹  n(A∪B)=6A \cup B = \{10, 11, 12, 13, 14, 15\} \implies n(A \cup B) = 6

  2. दिइएको सूत्रमा मानहरू प्रतिस्थापन गर्नुहोस्।

    n(A∪B)=n(A)+n(B)−n(A∩B)n(A \cup B) = n(A) + n(B) - n(A \cap B) 6=4+4−26 = 4 + 4 - 2
  3. समीकरणको दायाँ पक्षलाई सरल बनाउनुहोस्।

    6=8−26 = 8 - 2 6=66 = 6

    बायाँ पक्ष र दायाँ पक्ष बराबर भएकोले, सूत्र प्रमाणित भयो।

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