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>> okay. >> glenn: prove infinite series is convergent. you can't do this. >> all right. pick out the right color. i want you. all right. integal test. >> glenn: that's where i would have started. >> what? >> glenn: that is where i would have started. keep going. i have don't mean to throw you off-track. >> so then i have a theory. mm-hmm. >> and if it's convergent, the integral is con ver jent. so if it'sdy ver gent, the integral isdy ver jent -- divergent. two x, divided by one-plus,

Showed me in my office today. >> okay. >> glenn: prove infinite series is convergent. you can't do this. >> all right. pick out the right color. i want you. all right. integal test. >> glenn: that's where i would have started. >> what? >> glenn: that is where i would have started. keep going. i have don't mean to throw you off-track. >> so then i have a theory. mm-hmm. >> and if it's convergent, the integral is con ver jent. so if it'sdy ver gent, the integral isdy ver jent -- divergent. two x, divided by one-plus,