Applying Integral Test: Why did they integrate from 1 to ∞ instead of

InvalidID
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Consider example 4 in the attachment.

Why did they integrate from 1 to ∞ instead of e to ∞?
 

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InvalidID said:
Consider example 4 in the attachment.

Why did they integrate from 1 to ∞ instead of e to ∞?
Your textbook must have a theorem in which they present the integral test. Find it and see what it says.
 

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