Question: A sequence { a n } , n = 1 , 2 , 3 , dots is defined recursively by a _ 1 = 1

A sequence {an},n=1,2,3,dots is defined recursively by
a_1=1/2,
and
an=7an-1,n>1.
Then, an expression for a_n is
a.(72)n-1
b.,72n-1
c. None of the Given Choices
d.2n-17
e.7n-12
A sequence {an},n=1,2,3,dots is defined recursively by a_1=1/2, and an=7an-1,n>1. Then,

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