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satuan dr 7^2 adl 9
satuan dr 7^3 adl 3
satuan dr 7^4 adl 1
jadi
7^1234 + 7^2341 + 7^3412 + 7^4123= ....1 + ....7 + ....9 + ....3
= ....20
jadi satuan dr hasil perhitungan tsb adalah 0