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b = 2
a= 3
Un = a + (n-1)b
= 3 + (n-1)2
= 3 + 2n - 2
= 2n + 1
8. Un = 2n - 1
U1 = 2 . 1 - 1
= 1
U2 = 2 . 2 - 1
= 3
U3 = 2 . 3 -1
= 5
U4 = 2 . 4 - 1
= 7
9. U8 / U5 = 120 / 15
r⁷ / r⁴ = 8
r³ = 8
r = 2
10. Final = 2
Semifinal = 4
r = 2
U4 = 2 x 2³
= 2⁴
= 16
11. Maaf tdk terlalu tau jawabannya ini
12. U1 = 5√3
b = - √3
U1 = 5 √3
U2 = 4 √3
U3 = 3√3
U4 = 2√3
U5 = √3