A geometric sequence has first term and common ratio . What is the sum of its first terms?

Answer and explanation

Correct answer: E.

  1. Step 1: Use with , , .
  2. Step 2: .
Answer
.
Why not the others: is (it forgets to subtract ); is , i.e. ; is , the eighth term; is .

Practise more Arithmetic and geometric sequences.

Free questions with an explanation for every one, and full timed TMUA mock tests.

A geometric sequence has first term 5 and common… | TMUA