Question

Tolong dijawab + Dikasih Cara penyelesaiannya ya
*makasih

Answer 1

Verified answer

Mapel : Matematika
Kelas : IX SMP
Bab : Barisan dan deret

Pembahasan :
Perbandingan Rasio

U6/U3 = r³
384/48 = r³
r³ = 8
Rasio = 2

U3 = ar²
48 = a2²
4a = 48
a = 12

Maka...
Sn = a(rⁿ - 1)/(r - 1)
S5 = 12(2⁵ - 1)/(2 - 1)
S5 = 12(31)
S5 = 372

Answer 2

Verified answer

U6/U3 = r^3
384/48 = r^3
r^3 = 8
r= 2

U3 = ar^2
48 = a2^2
4a = 48
a = 12

Sn = a(r^n - 1)/(r - 1)
S5 = 12(2^5 - 1)/(2 - 1)
S5 = 12(32-1)/1
S5 = 12(31)/1
S5 = 372