A person is to count 4500 currency notes...

A person is to count 4500 currency notes. Let `a_(n)` 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 an A.P. with common difference -2, then the time taken by him to count at notes is `:`

125 minutes

135 minutes

24 minutes

34 minutes

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A person is to count 4500 currency notes. Let a_(n) denote the number of notes he counts in the nth minute. If a_(1) = a_(2) = "………" = a_(10) = 150 and a_(11) , a_(12),"……….." are in an A.P. with common difference -2, then the time taken by him to count at notes is :

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