Question

Diketahui 1+1/2+1/4+......... jumlah 4 suku yang pertama adalah?

Answer 1

Jumlah 4 suku pertama
= 1 + 1/2 + 1/4 + 1/8
= (8 + 4 + 2 + 1)/8
= 15/8

Answer 2

A = 1
r = 1/2

Sn =
a (1 - r^n)
_________
1 - r

1 (1 - (1/2)^4)
_____________
1 - 1/2

1 - 1/16
_______
1/2

15/16
_____
1/2

15/16 × 2/1

30/16

15/8