Combinatorics BasicCountingPrinciple NumberTheoryBasic AMC10/12
2010


Problem - 1527
Positive integers $a$, $b$, and $c$ are randomly and independently selected with replacement from the set $\{1, 2, 3,\dots, 2010\}$. What is the probability that $abc + ab + a$ is divisible by $3$?

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