A geometric sequence has second term and fifth term . What is the sum of its first five terms?
Answer and explanation
Correct answer: A.
- Step 1: , so . Then .
- Step 2: The terms are , with sum .
Answer
.
Why not the others: is , the sixth term; is half of ; and do not equal .
Practise more Arithmetic and geometric sequences.
Free questions with an explanation for every one, and full timed TMUA mock tests.
More Arithmetic and geometric sequences questions
- An arithmetic sequence has third term and seventh term . What is the th term?
- What is the sum of the first terms of the arithmetic sequence ?
- A geometric sequence has first term and common ratio . What is the sum of its first terms?
- The geometric series continues indefinitely. What is its sum to infinity?
- A geometric sequence of positive terms has second term and fourth term . What is the first term?
- What is the value of ?