What is the sum of the first 10 terms of the arithmetic sequence with first term 3 and common difference 2?

The sum of an infinite geometric series is 27, and its first term is 9. What is the common ratio?

What is the formula for the sum of the first 'n' natural numbers?

Find the 7th term of the geometric sequence: 2, 6, 18, ...

If the 3rd term of an arithmetic progression is 7 and the 7th term is 15, find the first term.

What is the sum of the series ∑(2k + 1) from k = 1 to 5?

Which of the following sequences is a harmonic progression?

What is the formula for the nth term of an arithmetic sequence?

The first term of a geometric sequence is 3 and the common ratio is 2. Find the 5th term.

If the sum of the first n terms of an AP is given by Sn = 3n^2 + 5n, then the common difference is?