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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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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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Oct 13, 2018
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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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21²=21×21
21×21=441
2,870+441=3,221
Samra
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Oct 20, 2018
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