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Let a and B Be Two Sets Such that N(A) = 45, N(B) = 38 and N(A ∪B) = 70, Find: N(B – A) - Mathematics

Sum

Let A and B be two sets such that n(A) = 45, n(B) = 38 and n(A ∪B) = 70, find: n(B – A)

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Solution

n(A) = 45, n(B) = 38 and n(A∪ B) = 70

We know that,

n(B – A) = n(A ∪ B) – n(A)

n(B – A) = 70 – 45 = 25

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 8.3
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