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In a test there were n questions. In the test 2n-1 students gave wrong answers to i questions where i = 1, 2, 3, ..., n. If the total number of wrong answers given is 2047 then n is
  • a)
    12
  • b)
    11
  • c)
    10
  • d)
    none of these
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In a test there were n questions. In the test 2n-1students gave wrong ...
 The number of students given exactly one wrong answer
2n-1 - 2n-2
The number of students giving exactly two wrong answers
= 2n-2 - 2n-3 etc.
∴ the total number of wrong answers 

or 
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Most Upvoted Answer
In a test there were n questions. In the test 2n-1students gave wrong ...
 The number of students given exactly one wrong answer
2n-1 - 2n-2
The number of students giving exactly two wrong answers
= 2n-2 - 2n-3 etc.
∴ the total number of wrong answers 

or 
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In a test there were n questions. In the test 2n-1students gave wrong answers to i questions where i = 1, 2, 3, ..., n. If the total number of wrong answers given is 2047 then n isa)12b)11c)10d)none of theseCorrect answer is option 'B'. Can you explain this answer?
Question Description
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