question_answer

A person is to count 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

A)  24 min            

B)  34 min

C)  125 min                       

D)  135 min

E)  None of these