mtk wajib kelas 11 nomor 6

Bab Barisan dan Deret
Matematika SMA Kelas X

Aritmatika
b = U2 - U1
  = log (2/3) - log 2
  = log ((2/3) . 1/2)
  = log (1/3)

U10 = a + 9 . b
       = log 2 + 9 . log (1/3)
       = log (2 . 1/3⁹)
      =  log (2/3⁹)

Sn = (n/2) . (a + Un)

S10 = (10/2) . (log 2 + log (2/3⁹)
        = 5 . (log (2 . 2/3⁹)
        = 5 log (2²/3⁹)
        = 5 (log 2² - log 3⁹)
        = 5 . 2 log 2 - 5 . 9 log 3
        = 10 log 2 - 45 log 3

jawabannya C