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The sequence of natural numbers is divided into groups as follow (1);(2,3);(4,5,6);(7,8,9,10) and so on.Find the sum upto the 'k'group

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by misrameghna

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by misrameghna

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As the u know the last term in the K group is K(K+1)/2

the sum of terms till is given by

the sum of terms till is given by