A geometric progression has first term and common ratio . Find its sum to infinity.

Answer and explanation

Correct answer: C.

  1. Step 1: The sum to infinity is because .
  2. Step 2: .
Answer
.
Why not the others: is what you get if you use in the denominator. is what you get if you start from the second term. is what you get if you multiply instead of dividing.

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