" 14.The sum of first a terms of the "APa,3a,5a,..." is "

What is the sum of first n terms of the AP a, 3a, 5a,….

Find the sum of first 24 terms of the A.P.a-1,a_(2),a_(3),... if it is inown 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

(i) 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

The sum of the first five terms of an A.P. and the sum of the first seven terms of the same A.P. is 167. If the sum of first 10 terms of this A.P. is 235, find the sum of its first twenty terms.

Mean of the first n terms of the A.Pa,(a+d),(a+2d)......... is

Find the sum of first 16 terms of an A.P.a_(1),a_(2),a_(3)......... If it is known that a_(1)+a_(4)+a_(7),+a_(10)+a_(16)=147

Sum to infinity of a GP is 15 and the sum to infinity of their squares is 45 .If a is the first term and r is the common ratio then the sum of the first 5 terms of the AP with first term a and common difference 3r is

The sum of the first five terms of an AP and the sum of the first seven terms of the same AP is 167. If the sum first ten terms of this AP is 235, find the sum of its first twenty terms.

Find the sum of the first 5 terms of the G.P whose first term is 1 and common ration is 2/3.