A.P.

Algebra Level pending

a person is to count 45,000 currency notes. let a(n) denotes the no. of notes he counts in the nth minute. if a(1)=a(2)=a(3)=.......=10(10)=150 & a(10), a(11),...... are in a.p. with common difference -2 , then time taken by him to count all notes is, - give answer in minutes:-

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