Question

Tentukan jumlah 10 suku pertama dari barisan bilangan berikut ini
d.1/2+1+2+4...

tolong jawab dong !!!

Answer 1

A = U1 = 1/2

r = U2/U1
r = 1/(1/2)
r = 1 × 2/1
r = 2

S10 = a . (rⁿ - 1)/(r - 1)
S10 = 1/2 . (2¹⁰ - 1)/(2 - 1)
S10 = 1/2 . (1024 - 1)
S10 = 1/2 . 1023
S10 = 511,5

Answer 2

R = U₂/U₁
  = 1 / 1/2
  = 1 × 2
  = 2

Sn = a(rⁿ-1)
          r - 1
S₁₀ = 1/2 (2¹⁰ - 1)
             2 - 1
      = 1/2 (1024 - 1)
                 1
      = 1/2 × 1023
      = 511,5