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

Sum

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

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Solution

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

We know that,

n(B – A) = n(B) – n(A n B)

n(B – A) = 20 – 6 = 14

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 10.2
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