Jawabanmu

2014-09-12T19:54:46+07:00
2014-09-12T20:05:55+07:00
A = 2, b = 2, Rumus Sn = 1/2n + (a + Un), U₅₀ = 100

S₅₀ = 1/2(50) + (2 + 100)
      = 25 + 102
      = 127