选择题
2026 AMC 8 Problem 21: Spider on a Star Web
Charlotte the spider is walking along a web shaped like a 5-pointed star, shown in the figure below. The web has 5 outer points and 5 inner points. Each time Charlotte reaches a point, she randomly chooses a neighboring point and moves to that point. Charlotte starts at one of the outer points and makes 3 moves (re-visiting points is allowed). What is the probability she is now at one of the outer points of the star?
2026 AMC 8 第 21 题：星网上的蜘蛛
蜘蛛夏洛特正沿着一张五角星形的网行走，如下图所示。腹板有 5 个外点和 5 个内点。每次夏洛特到达一个点时，她都会随机选择一个相邻点并移动到该点。夏洛特从外侧点之一开始，走 3 步（允许重新访问点）。她现在位于恒星外点之一的概率是多少
A.
1/5
B.
1/4
C.
2/5
D.
1/2
E.
3/5