AMC 8 2024 - Problem 4

When Yunji added all the integers from 1 to 9, she mistakenly left out a number. Her incorrect sum turned out to be a perfect square. What number did Yunji leave out?

(A)
(B)
(C)
(D)
(E)
Answer:
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Tagged: AMC 8 free test, AMC 8 daily question

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