一道很简单的sat数学题!The first term in the sequence above us a,and each term after the first is 3 times the preceeding term.If the sum of the first 5 terms is 605,what is the value of

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一道很简单的sat数学题!The first term in the sequence above us a,and each term after the first is 3 times the preceeding term.If the sum of the first 5 terms is 605,what is the value of
一道很简单的sat数学题!
The first term in the sequence above us a,and each term after the first is 3 times the preceeding term.If the sum of the first 5 terms is 605,what is the value of

一道很简单的sat数学题!The first term in the sequence above us a,and each term after the first is 3 times the preceeding term.If the sum of the first 5 terms is 605,what is the value of
a1=n,an=3*a(n-1)
s5=a1+a2+a3+a4+a5=605
a1=5
the value of a is 5

a+3a+9a+27a+81a=121a=605 so a=5

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