Let, A = {(2n, 3n): n ϵ N} and B = {(3n, 5n): n ϵ N}. What is (A ∩ B) equal to?

  1. {(2n, 3n): n ϵ N}
  2. {(2n, 5n): n ϵ N}
  3. {(n, 3n): n ϵ N}
  4. ϕ

Answer (Detailed Solution Below)

Option 4 : ϕ
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Detailed Solution

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Concept:

The intersection of two sets X and Y is the set of elements that are common to both set X and set Y. It is denoted by X ∩ Y and is read ‘X intersection Y ’

 

Calculation:

A = {(2n, 3n): n ϵ N}

= {(2, 3), (4, 6), (6, 9), ………} And

B = {(3n, 5n): n ϵ N}

= {(3, 5), (6, 10), (9, 15), ………}

There is no member common to both the sets

∴ A ∩ B = ϕ

Hence, option (4) is correct.
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