UPSC NDA 2 2017 Mathematics Solved Paper
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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 a 1 = a 2 = a 3 = . . = a 10 = 150 , and a 10 , a 11 , a 12. . . 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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