A sequence is defined by f(1)=5 and f(n)=3f(n-1) for n>0. Which of the following statements defines the nth term of f?
1)f(n)=5(3)^(n-1)
2)f(n)=3(5)^(n-1)
3)f(n)=5+3an
4)f(n)=3+5^(n-1)

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