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Use the formula for the sum of the first n terms of the geometric sequence, and then state the indicated sum?
81+9+1+1/9+1/81
s5=
1 Answer
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- ?Lv 72 days agoFavorite Answer
81, 9, 1, 1/9, ...
a_n = 9^(3 - n)
S5
= 81 + 9 + 1 + 1/9 + 1/81
= 7381/81
= 91.12345679012345...
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