5/6-5+30-180+...hitung s5

jawab

a = 5/6
r = - 6

sn = a . ( 1- r^n) / (1 - r(
s5=  5/6 . ( 1 - (-6)⁵)  /(1 - (-6))
s5 = 5/6 ( 7777)/(7)
s5 = 5/6 (1111)
s5= 5.555/6