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 person is to count 4500 notes. Let an denote the number of notes he

1.	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 minutes
B.	34 minutes
C.	125 minutes
D.	135 minutes
Answer» C. 125 minutes

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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

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