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Misal :
U1 = 7+(1-1)5
= 7+(0)5
=7
U2 = 7+(2-1)5
=7+(1)5
=7 +5 = 12
U3 = 7+(3-1)5
=7+(2)5
=7+10 = 17
r = 12/7
Un=ar^n-1
=7.12/7^n-1
=12^n-1
b. dik: a=6
b=11/6
Un=ar^n-1
=6.11/6^n-1
=11^n-1
ket:
^n-1=pangkat n-1