nilai deret geometri tak hingga 8-4+2-1 adalah

8-4+2-1 = (8-4) + (2-1) = 4 + 1 = 5.

8 -4 + 2 -1 + 1/2 -...
a = 8
r = -4/8 = -1/2

D =... a
..~ --------- =
........1 - r
.......8
-------------- =
..1 - (-1/2)
..... 8
-------------- =
....1 + 1/2
.... 8
------------
.....3/2
= 8 × 2/3
= 16/3
= 5 1/3
jadi nilai deret geometri tak hingga 8-4+2-1 adalah 5 1/3