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KCET2021MathematicsSets and Relations

A and B are non-singleton sets and n(A B)=35 . If B A , then n(A) n(B) is equal to

Options

  1. A28
  2. B35
  3. C42
  4. D21

Correct answer

D. 21

Step-by-step solution

Given, n(A B)=35, B An(A B)=35n(A B)=7 5n(A B)=n(A) n(B) n(A)=7 and n(B)=5 n(A) n(B) = 7 5 = 7 2 =21

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