Determine the sum of the numbers — task. Mathematics State Board, Class 10.

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Answer variants:

2931

45530

2923

45526

2926

45524

1.

1 + 2 + 3 + ... + 76

\(=\)

2.

1^{2} + 2^{2} + 3^{2} + ... + 51^{2}

\(=\)

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