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U3 = 2
U7 = 1250
U7 = Ar^6
-------------------
U3 = Ar^2
1250 = r^6
-------------------
2 = r^2
625 = r^4 >>>> 5^4 = 625
r = 5
U3 = Ar^2
2 = A × 5^2
2/25 = A
U5 =Ar^4
......= 2/25 × 5^4
......= 50
tolong di cek lagi kali aja ada kurang teliti.
Cari rasio :
Cari awal :
Maka, suku ke 5 :