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U3 = ar^2 = 2
U6 = ar^5 = 54
Maka, r bisa dicari melalui u6/u3 => ar^5 / ar^2 = 27 => r^3 = 27 => r = 3
Jadi U4 = U3 x r = 2 x 3 = 6
Semoga membantu :)