A person is to count 4500 currency notes...

A person is to count 4500 currency notes. Let an denote the number of notes he counts in the nth minute. If `a_1=""a_2="". . . . . .""=""a_(10)=""150` and `a_(10),""a_(11),"". . . . . .` are in A.P. with common difference 2, then the time taken by him to count all notes is

24 minutes

34 minutes

125 minutes

135 minutes

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A person is to cout 4500 currency notes. Let a_(n) denotes the number of notes he counts in the nth minute. If a_(1)=a_(2)="........"=a_(10)=150" and "a_(10),a_(11),"......", are in AP with common difference -2 , then the time taken by him to count all notes is

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