Jawapan

2016-02-14T16:09:28+08:00
Bilangan sebutan gunakan formula tn=ar^n-1
a.1
r.1.1÷1

tn = 1 (1.1) ^n-1
1 (1.1)^n-1 = 1.771561
1.1^n-1 = 1.771561÷1
n-1 log 1.1 = log 1.771561
n-1 = log 1.771561÷log 1.1
n-1=6
n = 6+1
n = 7 gunakan formula hasil tambah sn= a (1-r^n)÷1-r s7= 1 (1-1.1^7)÷1-1.1 s7 = -0.9487÷-0.1 s7 = 9.487