The first word 'pertambahan' (the increase)has connection with 'bertambah' which is an intransitive verb. For example, "Kes kemalangan di jalan raya semakin bertambah." [Accient cases on the road keep increasing.]As a noun, 'pertambahan' can be replaced with 'bertambahnya' (the additionn of 'nya' turns 'bertambah' into a noun) Look at the following sentences:
a) Pertambahan kes demam denggi membimbangkan penduduk di sana. [The increase of dengue fever cases worries the people there.]
b) Bertambahnya kes demam denggi membimbangkan penduduk di sana. [The increase of dengue fever cases worries the people there.]
As for 'penambahan' which means 'addition', it has connection with the transitive verb 'menambah' (to increase)
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