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7^n - 1 = 6
7^n = 7
n= 1
bukti :
7^n - 1 - 6 = 0
7^1 - 1 - 6 = 0
7-1-6 = 0
0= 0
Jadi 7^n-1 habis dibagi 6
*maaf klo salah* *tapi intinya begitu* *kurang bisa ngerangkai bahasanya*