Suppose that ak 0. Prove that k=1 ak converges if and only if the series k=1

Question:

Suppose that ak → 0. Prove that ∑∞k=1 ak converges if and only if the series ∑∞k=1 (a2k + a2k+1) converges.
Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For  book-img-for-question
Question Posted: