Sequences and series

Question 1 of 10

Find the 8th term of the GP 2, 4, 8, ...

Question 2 of 10

The sum of the first n terms of an AP is n² + 2n. Find the 10th term.

Question 3 of 10

Find the sum 2 + 6 + 18 + 54.

Question 4 of 10

Find the sum of the first 5 terms of the GP 3, 6, 12, ...

Question 5 of 10

The nth term of a sequence is 3n + 2. Find the 15th term.

Question 6 of 10

What is the 6th term of the geometric sequence 2, 6, 18, …?

Question 7 of 10

The nth term of a GP is 3 × 2ⁿ⁻¹. Find the sum of the first 6 terms.

Question 8 of 10

Find the sum to infinity of the geometric series 12 + 6 + 3 + …

Question 9 of 10

What is the common ratio of the geometric sequence 81, 27, 9, …?

Question 10 of 10

Find the sum of the first 20 natural numbers.