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mNiqMMavannnner mNiqMMavannnner
  • 11-02-2016
  • Mathematics
Answered

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.

Verified Answer :

MichaelLiu
MichaelLiu MichaelLiu
  • 11-02-2016

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

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