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2021 AMC 10A Problem 25

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2021 AMC 10A Problem 25AMC 10 Step by Step

Name: Date: September 13, 2026

Paths & Grids · difficulty 4 of 5 · about 9 min · position P21-25

How many ways are there to place $3$ indistinguishable red chips, $3$ indistinguishable blue chips, and $3$ indistinguishable green chips in the squares of a $3 \times 3$ grid so that no two chips of the same color are directly adjacent to each other, either vertically or horizontally?

A)
$12$
B)
$18$
C)
$24$
D)
$30$
E)
$36$

2021 AMC 10A Problem 25

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