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Question

If |a|=|b|=|a+b|=1,then|ab| is equal to 
  1. 3
  2. None of these
     
  3. 1
  4. 2


Solution

The correct option is A 3
We have,
|a+b|2+|ab|2=2(|a|2+|b|2)1+|ab|2=4|ab|2=3

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