Which of the following could be the sum of 1 + 2 + 3 + ... + n, where n≤10? Ind...【小站备考】

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Question 12 Select one or more answer choices

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Which of the following could be the sum of 1 + 2 + 3 + ... + n, where n≤10? Indicate all possible correct answers.

A.10

B.14

C.21

D.28

E.36

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