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If the sum of the first 3𝑛 positive integers is 150 more than the sum of the first 𝑛 positive integers, then find the sum of the first 4𝑛 positive integers.

 Dec 16, 2021
 #1
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I know this.  The answer is 450.

 Dec 16, 2021
 #2
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Like so:

 

 Dec 16, 2021

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