Let A 7 8 9 10 11 12 and B 7 10 14 15 What is the number of elements in A minus B and B minus A resp...........

Quantitative Aptitude (CDS) Number System

Let A = {7, 8, 9, 10, 11, 12} and B = {7, 10, 14, 15} . What is the number of elements in (A − B) and (B − A) respectively?

2 and 4

4 and 2

2 and 2

4 and 4

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Explanation:

A={7,8,9,10,11,12}
B={7,10,14,15}
A-B=[x $\varepsilon$ A and x $\cent$ B]
So, A-B={8,9,11,12}
Number of elements in (A-B)=4
Also,
B - A =[x:x??R and x∉A]
So, B−A={14,15}
Number of elements in (B−A)=2
Hence option (2)

By: Munesh Kumari

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Let A 7 8 9 10 11 12 and B 7 10 14 15 What is the number of elements in A minus B and B minus A resp...........

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Explanation:

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