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Let N(A) 30, N(B) = 27 and N(A∪B) = 45, Find: N(A - B). - Mathematics

One Line Answer

Let n(A) 30, n(B) = 27 and n(A∪B) = 45, find: n(A - B).

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Solution

n(A) = 30, n(B) = 27 and n(A ∪ B) = 45

We know that,

n(A-B) = n(A ∪B) – n(B)

n(A – B) = 45 – 27 = 18

Concept: Concept for Cardinal Property of Sets
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APPEARS IN

Selina Concise Mathematics Class 7 ICSE
Chapter 13 Set Concepts (Some Simple Divisions by Vedic Method)
Exercise 13 (D) | Q 9.2
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