試題詳解

6. We already know that the series is convergent. Now, rewrite the series by combining 2ⁿ consecutively positive terms in the series, then followed by 2ⁿ consecutively negative terms, where n = 1, 2, 3, …, to get a new series as follows:
+... , then the new series is still convergent.
(A)O
(B)X