In the figure below, each circle will be filled with a digit from 1 to 6. Each digit must appear exactly once. The sum of the digits in neighboring circles is shown in the box between them. What digit must be placed in the circle marked with a question mark ?
A. 2
B. 3
C. 4
D. 5
E. it is impossible to fill the circles
不存在满足条件的填法

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完整解法

1. 2026 AMC 8 官方解析

$1, 2, 3, 4, 5, 6$ .

①从9入手， $9 = 3 + 6 = 4 + 5$ .

$3, 6$ 组经过验证、不行，因此用 $4 + 5$ .

答案

A. 2

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