Hello! How can I justify that the infinite series 1 - 1 + 1 - 1 + 1 - 1.... is divergent? If I were to look at this, I see every two terms canceling out and thus, and assume that it is convergent since the sum doesn't blow up. That's what my intuition would tell me. I know I can use different tests to figure out that it is divergent, but I don't have an intuition for why it's so. Any ideas? Thanks!