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`
What is the sum of first 300 terms?

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

If the first four terms of an arithmetic sequence are a,2a,b and (a-6-b) for some numbers a and b, find the sum of the first 100 terms of the sequence.

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.