The rth term of the series `2(1/2)+1(7/13)+1(1/9)+20/23+.....` is

The 15 th term of the series 2(1)/(2)+1(7)/(13)+1(1)/(9)+(20)/(23)+...is(10)/(39) b.(10)/(21) c.(10)/(23) d.none of these

The 15th term of the series 2 1/2+1 7/(13)+1 1/9+(20)/(23)+.... i s (10)/(39) b. (10)/(21) c. (10)/(23) d. none of these

The 15th term of the series 2 1/2+1 7/(13)+1 1/9+(20)/(23)+.. is

The 15th term of the series 2 1/2+1 7/(13)+1 1/9+(20)/(23)+.. is

The 15th term of the series 2 1/2+1 7/(13)+1 1/9+(20)/(23)+ i s (10)/(39) b. (10)/(21) c. (10)/(23) d. none of these

The nth term of the series 2 1/2+1 7/3+1 1/9+20/23+………. Is (A) 20/(5n+3) (B) 20/(5n-3) (C) 20(5n+3) (D) 20/(5n^2+3)

The 7th term of the series 1,-1/2,1/4,.... is

Find the sum to n terms of the series , (1)/(1.2)+(1)/(2.3)+(1)/(3.4)+.... ?

Sum of the series 1-2((1)/(3.5)+(1)/(7.9)+(1)/(11.13)+......) is

Sum to n terms of the series 1+3+7+13+.. .=