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r = 4/1 = 4
Un = ar^(n-1) = 1 (4)^(n-1)
Un = 4^(n-1)
U10 = 1 (4)^9
= 262.144
rumus suku ke-n=> Un=ar^n-1
Un=1*4^n-1
Un=4^n-1
suku ke-10=> Un=ar^n-1
U10=1*4^10-1
U10=4^9
U10=262.144