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Hi, The first snippet calculates the square of i directly inside the loop's summing expression. This means that the multiplication operation i * i is performed each iteration. The second snippet calculates the square of i and stores it in a separate variable square before adding it to the sum. This means that the multiplication operation is only performed once per iteration. In terms of performance, the difference between the two approaches is likely negligible in this case. However, the second approach might be slightly more readable and maintainable, especially if the calculation of the square of i becomes more complex or is used in multiple places within the loop. Thank you