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sum of consecutive odd numbers starting with 1

express the following as a sum of consecutive odd numbers starting with 1- -
7^2 
81
5^2 
11^2
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1 Answer

Sum of odd integers: Sn = n2
49 = n2
7 = n
49 = 1 + 3 + 5 + 7 + 9 + 11 + 13
 
Can you follow the pattern and do the other three?