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The sum of the first [math]n[/math] odd natural number is [math]n^2[/math], but what is the sum of first [math]n[/math] natural even number?
Can you tell me what is the sum of the first [math]n[/math] natural even numbers?
Yes! The sum of the first [math]n[/math] natural even numbers is [math]n(n+1)[/math].