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+1 vote
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in Arithmetic Progression by (53.5k points)

A person is to count 4500 currency notes. Let an denotes the number of notes he counts in the nth minute. If a1 = a2 = ............a10 = 150 and a10, a11...........are in A.P with common difference – 2, then the time taken by him to count all notes is

(a) 24 min

(b) 34 min

(c) 125 min

(d) 135 min

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1 Answer

+1 vote
by (53.3k points)

Correct option is (b) 34 min

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