Which is the primary reason that the australian population is clustered around its major cities

The economy of the country is dominated by industry. The inland region is mountainous terrain that is too difficult to inhabit. People settle in the areas with the mildest climates, and this is where most of the cities then developed.

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7.03-1.70=5.33 and 6.80+5.09=11.89 and 5.5-3.01=2.49