Write the first 3 terms of each of the arithmetic sequence below.
First terms 30, sum of first six terms is 300

Write the first five terms of each of the sequences whose n^(th) terms are: a_n (n+2)

Write the first five terms of each of the sequences whose n^(th) terms are: a_(n) =n(n^2+5)/4

The ratio of 11th term to 18th term of an AP is 2:3. Find the ratio of 5th term to the 21st term, also the ratio of the sum of the first 5 terms to the sum of the first 21 terms.

If the sum of first 7 terms of an AP is 49 and that of 17 terms is 289, find the sum of first n terms.