Sum of the first 4 terms of an arithmetic sequence is 72. Sum of the first 9 terms is also 72.
What is the `5^(th)` term of the sequence?

The sum of first 'n' terms of an arithmetic progression is 210 and sum of its first (n-1) terms is 171. If the first term 3, then write the arithmetic progression.

7th term of an A.P. is 40. then the sum of the first 13 terms is