Question

Diketahui deret 3 + 6 + 12 + 24 + 48 + ... Tentukan U_{11} dan tolong jelaskan caranya...

Answer 1

Sn = n/2 + ( U1(2) + (n-1)b
S11= 11/2 + ( 6 + (10*3)
s11= 5,5 + 36
S11 = 41,5

*sorry kalau salah*

Answer 2

A=3
r=2

jawab

U11= U5. r^6
      = 48. 2^6
      = 48. 64
      = 3072