If the terms of the arithmetic sequence `2/9, 3/9, 4/9, 5/9, ...` are represented as `x_1, x_2, x_3, .... then`
Find the sum of first 9 terms.

Which term of the sequence 1/3,1/9,1/27,……..is I/19683 ?

If the sum of first 8 terms of an Arithmetic progression is 136 and that of first 15 terms is 465, then find the sum of first 25 terms. OR Ths sum of the 5th and 9th terms of an A.P. is 40 and the sum of the 8th and 14th term is 64. Find the sum of the first 20 terms.

Find the sum: (-3)/(-11)+ (5/9)

The third term of a G.P. is 9. The product of its first five terms is

The sums of n terms of two arithmetic progressions are in the ratio 5n + 4 : 9n + 6. Find the ratio of their 18^(th) terms.

Find the area of the region bounded by y^2=9x,x=2,x=4 and the X-axis in the first quadrant.