Answer:
75(1/5)^n-1
Explanation:
I just did it.
Step-by-step explanation:
it is geometric
so we will use this equation:
a(n)=a1*(r)^(n-1)
and we have a(1)=75 , r=15/75=3/15=1/3
explicit formula: a(n)=75*(1/3)^(n-1)
hope this helps
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