JamesLachoneus
18.10.2019 •
Mathematics
Ok i need the answer is c but i didn't understand the teacher explanation pls me
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Ответ:
geometric series a(n) = a1r^(n-1)
r = a(n+1)/a(n)
-6/9 = -2/3
4/-6 = -2/3
-8/3/4 = -2/3
so r = -2/3 and a1 = 9
Sn = a1(1-r^n)/(1-r) = 9(1-(-2/3)^n)/(1-(-2/3))
n is infinite Sn = 9/(5/3) = 27/5
Ответ:
Your answer would be 20 not 10
Step-by-step explanation:
trust me i took the test