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Easy

Question

In a certain test there are n questions. In this test 2n–i student gave wrong answers to atleast i questions where i = 1, 2, 3 ..... n . If the total no. of wrong answer given is 2047. Then n is equal to-

  1. 10  
  2. 11  
  3. 12  
  4. 13  

The correct answer is: 11

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