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Syahputri, Z. , Sutarman and Machrani Adi Putri Siregar 2024. Determining The Optimal Number of K-Means Clusters Using The Calinski Harabasz Index and Krzanowski and Lai Index Methods for Groupsing Flood Prone Areas In North Sumatra. Sinkron : jurnal dan penelitian teknik informatika. 8, 1 (Jan. 2024), 571-580. DOI:https://doi.org/10.33395/sinkron.v9i1.13246.