Question

Find the sum of the following series 1^2 +2^2 +3^2+4^2+5^2+6^2+7^2

Answer 1

Answer:

${1}^{2} + {2}^{2} + {3}^{2} + {4}^{2} + {5}^{2} + {6 }^{2} + {7}^{2} = \\ 1 + 4 + 9 + 16 + 25 + 36 + 49 = \\ 140$