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ar² = 50
U₅ = 1250
ar⁴ = 1250
ar² . r² = 1250
50r² = 1250
r² = 25
r = 5
U₄ + U₆ = ar³ + ar⁵
= ar² (r+r³)
= 50 (5+5³)
= 50 (5+125)
= 50 (130)
= 6500
maaf ya kalo salah ^_^