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Can someone who understands basic sigma notation look at this problem please!

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I ran into this problem in my algebra book. Please tell me the answer is 27 and this book is mistaken before I pull my hair out. Thanks :) 4 ő£ (n^2+1)= 75 N=3

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That must be n=3, not N=3. (3² + 1) + (4² + 1) = (9 + 1) + (16 + 1) = 10 + 17 = 27

            
        

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