The `n^(th)` term of the series `15+20+25+...` is 115 then `n=`

The n^(th) term of the series 6+66+666+.....

The n^(th) term of the series a + a r + a r 2 + − − − − is

Find n^(th) term of the series 1+(1+2)+(1+2+3)+.... Find the sum to n terms of the series

The n^(th) term of 3,7,11,15,…… is:

If the n^(th) term of the A.P. 9, 7, 5, .... is same as the n^(th) term of the A.P. 15, 12, 9, .... find n.

For what value of n , the n^ (th) terms of the series " 5+10+20+...... and 1280+640 +320+. . are equal

The n^(th) term of a GP 5,25,125,... is

Find the n^(th) term of the series 2+(5)/(9)+(7)/(27) + …… . Hence find sum to n terms.

Find the 20^( th) term of the series 2 xx 4+4 xx 6+6 xx 8+. . .,+ n terms.

The n th term of a progression is 3n-5 .Find its 15th term.