A cricketer has to score 4500 runs. Let `a _(n)` denotes the number of runs he scores in the `n ^(th)` match. If `a _(1)=a_(2)= …. a _(10) =150` and `a _(10) , a _(11), a_(12)….` are in A.P. with common difference `(-2)`. If N be the total number of matches played by him to scoere 4500 runs. Find the sum of the digits of N.

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 :

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

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 person is to count 4500 currency notes, Let a_n denote the number of notes he courts 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 all notes is :

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 (1) 34 minutes (2) 125 minutes (3) 135 minutes (4) 24 minutes

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 (1) 34 minutes (2) 125 minutes (3) 135 minutes (4) 24 minutes

n^(th) term of an A.P. is a_(n) . If a_(1)+a_(2)+a_(3) = 102 and a_(1) = 15 , then find a_(10) .

If a_(1), a_(2), …..,a_(n) are in A.P. with common difference d ne 0, then the sum of the series sin d[sec a_(1)sec a_(2) +..... sec a_(n-1) sec a_(n)] is