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A person is to count 4500 currency notes. Let an denote the number of notes he counts in the nth minute. If a1 = a2 = ... = a10 = 150 and a10, a11, ... are in an AP with common difference –2, then the time taken by him to count all notes is [2010]
  • a)
    34 minutes
  • b)
    125 minutes
  • c)
    135 minutes
  • d)
    24 minutes
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A person is to count 4500 currency notes. Let an denote the number of ...
Till 10th minute number of counted notes = 1500
n2 - 149n + 3000= 0
⇒ n = 125, 24
But n = 125 is not possible
∴ total time = 24 + 10 = 34 minutes.
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A person is to count 4500 currency notes. Let an denote the number of notes he counts in the nth minute. If a1 = a2 = ... = a10 = 150 and a10, a11, ... are in an AP with common difference –2, then the time taken by him to count all notes is [2010]a)34 minutesb)125 minutesc)135 minutesd)24 minutesCorrect answer is option 'A'. Can you explain this answer?
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A person is to count 4500 currency notes. Let an denote the number of notes he counts in the nth minute. If a1 = a2 = ... = a10 = 150 and a10, a11, ... are in an AP with common difference –2, then the time taken by him to count all notes is [2010]a)34 minutesb)125 minutesc)135 minutesd)24 minutesCorrect answer is option 'A'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about A person is to count 4500 currency notes. Let an denote the number of notes he counts in the nth minute. If a1 = a2 = ... = a10 = 150 and a10, a11, ... are in an AP with common difference –2, then the time taken by him to count all notes is [2010]a)34 minutesb)125 minutesc)135 minutesd)24 minutesCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A person is to count 4500 currency notes. Let an denote the number of notes he counts in the nth minute. If a1 = a2 = ... = a10 = 150 and a10, a11, ... are in an AP with common difference –2, then the time taken by him to count all notes is [2010]a)34 minutesb)125 minutesc)135 minutesd)24 minutesCorrect answer is option 'A'. Can you explain this answer?.
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