SOLUTION: What is the sum of the first 25 natural numbers?

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Question 409187: What is the sum of the first 25 natural numbers?
Answer by richard1234(7193) About Me  (Show Source):
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Using the formula sum%28i%2C+i+=+1%2C+n%29+=+n%28n%2B1%29%2F2 we have sum%28i%2C+i+=+1%2C+25%29+=+25%2826%29%2F2+=+325.