Riemann sum limit. In fact, we will interpret this limit as an integral. We will see the indeterminate form of 0+0+0+... doesn't necessary approach 1. This is actually the integral of sqrt(x) from 0 to 1 and we get 2/3 for the answer. If you would like more calculus tutorials like this, then check out my just calculus channel: https://www.youtube.com/justcalculus

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