Question

Jumlah suku dari deret geometri 2+1++1/2+1/4 sampai 8 suku

Answer 1

2+1+1/2+1/4  ------> a = 2 ; r = 1/2
Sn = a{(1 - (r^n)} / (1 - r)
     = 2 {(1 - (1/2)^8} / 1 - 1/2
     = 2 (1 - 1/256) / (1/2)
     = 2 (255/256) x 2
      = 4.(255/256)
      = 255/64
      = 3 63/64

Answer 2