UPSC NDA 2 2017 Mathematics Solved Paper

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Question : 20 of 120
 
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A person is to count 4500 notes. Let an denote the number of notes he counts in the nth minute. If a1=a2=a3=..=a10=150 , and a10,a11,a12...are in AP with the common difference −2 , then the time taken by him to count all the notes is
[NDA II 2017]
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