mNiqMMavannnner mNiqMMavannnner

12-02-2016
Mathematics

contestada

The first square number is 1, and the sum of the first 20 square numbers is 2870. Work out the sum of the first 21 square numbers.

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MichaelLiu MichaelLiu

12-02-2016

The 21st square number is 21^2 = 441
2870 + 441 = 3311

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