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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

User JKLIR
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1 Answer

6 votes
21²=21×21
21×21=441

2,870+441=3,221
User Samra
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