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Let N(A) = 31, N(B) = 20 and N(A ∩ B) = 6, Find: N (A - B). - Mathematics

One Line Answer

Let n(A) = 31, n(B) = 20 and n(A ∩ B) = 6, find: n (A - B).

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Solution

n(A) = 31, n(B) = 20 and n(A ∩ B) = 6

We know that,

n(A – B) = n(A) – n(A ∩ B)

n(A - B) = 31 - 6 = 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 10.1
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