Given sequence has first five terms 1,1/2,1/4,1/8,1/16 .
This is a Geometric progression with first term "(a)" "=1" and common ratio "(r) = \\frac{1}{2}" .
Hence, its general term is "a_n = a r^{n-1}"
"\\implies a_n = \\frac{1}{2^{n-1}}" .
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