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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
A. 24 minutesB. 34 minutes C. 125 minutes D. 135 minutes
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