A geometric sequence has second term and fifth term . What is the sum of its first five terms?

Answer and explanation

Correct answer: A.

  1. Step 1: , so . Then .
  2. 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.