Question

Find if 7: 14 ∷ 15: ​

Answer 1

Answer:

Step-by-step explanation:

7/14=15/x

1/2=15/x

cross multiply

1*x=15*2

x=30

Answer 2

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• Sudipta Pradhan
• , studied at DAV Public School, Unit-8, Bhubaneswar
• Answered 3 years ago
• If A and B are disjoint sets. Intersection of A and B will give fi. So n(a union b ) will become n(A) + n(B) only.
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• Seshadri Kesavan
• , BE CSE from Madras Institute of technology
• Answered 2 years ago · Author has 449 answers and 1.3M answer views
• If A and B are disjoint set then what is n(A-B)?
• Since A and B are disjoint sets, there are no common elements among A and B i.e., set intersection is empty.
• In set difference, we exclude the common elements among both the sets and write the remaining elements of the first set.
• Here, there are no common elements and we should write the first set elements as it is.
• Therefore,
• A−B=A, if A and B are disjointA−B=A, if A and B are disjoint
• ⟹n(A−B)=n(A)⟹n(A−B)=n(A)
• In other words, the cardinality of set difference can be expressed as:
• n(A−B)=n(A)−n(A∩B)n(A−B)=n(A)−n(A∩B)
• [∵We exclude common elements [∵We exclude common elements 
• and write the rest of the first set and write the rest of the first set 
• (i.e., here it's set A) elements.](i.e., here it's set A) elements.]
• [Similarly, n(B−A)=n(B)−n(A∩B)n(B−A)=n(B)−n(A∩B) ].
• Here, A and B are disjoint, thus there is no set intersection.
• n(A∩B)=0n(A∩B)=0
• ⟹n(A−B)=n(A)⟹n(A−B)=n(A)
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