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Let a and B Be Two Sets Such that N(A) = 75, M(B) = 65 and N(A ∩ B) = 45, Find: N(B – A) - Mathematics

One Line Answer

Let A and B be two sets such that n(A) = 75, M(B) = 65 and n(A ∩ B) = 45, find: n(B – A)

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Solution

n(A) = 75, n(B) = 65 and n(A ∩ B) = 45

We know that,

n(B – A) = n(B) – n(A ∩ B) n(B – A)

= 65 – 45 = 20

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 7.3
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