" 3."n^(" th ")" term of A.P.is a .If "a_(r)+a_(2)+a_(n)=102" and "a_(i)=15," then find "a_(10^(@))

nth term of an AP is a_(n). If a_(1)+a_(2)+a_(3)=102 and a_(1)=15, then find a_(10)

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) .

Let a_(n) be the nth term of an A.P. and a_(3) + a_(5) + a_(8) + a_(14) + a_(17) + a_(19) = 198 . Find the sum of first 21 terms of the A.P.

The successive terms of an A.P.are a_(1),a_(2),a_(3),... .If a_(6)+a_(9)+a_(12)+a_(15)=20, then sum_(r=1)^(20)a_(r)

The successive terms of an A.P. are a_(1), a_(2), a_(3) ,….. If a_(6)+a_(9)+a_(12)+a_(15)=20 then sum_(r=1)^(20)a_(r) =

Let a_(1) ,a_(2) ,a_(3) ,cdots ,a_(n) are in A.P such that a_(n) =100 , a_(10)- a_(39 ) = (3)/(5) then find the 15^(th) term of A.P. from end.

If a_(n) = (n - 3)/4 , then find a_(11),a_(15) and hence find a_(15)/a_(11) .

If an A.P.is such that (a_(4))/(a_(7))=(2)/(7), find (a_(6))/(a_(8))

Find the sum of first 24 terms of the A.P. a_(1) , a_(2), a_(3) ...., if it is know that a_(1) + a_(5) + a_(10) + a_(15) + a_(20) + a_(24) = 225

Find the sum of first 24 terms of the A.P. a_(1) , a_(2), a_(3) ...., if it is know that a_(1) + a_(5) + a_(10) + a_(15) + a_(20) + a_(24) = 225