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The pattern follows a sequence of triangular numbers. Each number in the sequence is derived by adding consecutive integers: 1 (1), 1 + 2 (3), 1 + 2 + 3 (6), 1 + 2 + 3 + 4 (10), and so on. Therefore, the next number in the sequence can be found by adding 5 to the previous number, resulting in 21 + 6 = 28.

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1w ago

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