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Ta có: \(327\le a< b< c\le330\)
\(\Rightarrow\left(a;b;c\right)\in\left\{\left(327;328;329\right);\left(328;329;330\right);\left(327;329;330\right)\right\}\)
Ta có: \(327\le a< b\le330\)
\(\Rightarrow\left(a;b\right)\in\left\{\left(327;328\right);\left(328;329\right);\left(329;330\right);\left(327;329\right);\left(327;330\right);\left(328;330\right)\right\}\)