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.

Respuesta :

MichaelLiu MichaelLiu

12-02-2016

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

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