15.
3(1)
6(2)
12(3)
24(4)
48(5)
96(6)
192(7)
c.7
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15.
3(1)
6(2)
12(3)
24(4)
48(5)
96(6)
192(7)
c.7
a = -3
U2 = 6
U3 = -12
Ditanya :
-192 = Un?
Jawab :
r = =
r = =
r = -2
Un = a ×
-192 = -3 ×
= 64
=
n - 1 = 6
n = 7 (C)
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Diketahui :
a = 3
U4 = 81
Ditanya :
U5?
Jawab :
Un = a ×
U4 = 3 ×
81 = 3 × r³
r³ = 27
r =
r = 3
Un = a ×
U5 = 3 ×
U5 = 3 × 3⁴
U5 =
U5 = 243 (D)