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Question

Given two sets A={a,b,c,d},B={b,c,d,e}, then n[(A×B)(B×A)] is 
  1. 3
  2. 16
  3. 4
  4. 9


Solution

The correct option is D 9
n[(A×B)(B×A)]=n(AB)×n(BA)=3×3=9

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