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【单选题】
在等比数列{a n }中,a 6 与a 7 的等差中项等于48,a 4 a 5 a 6 a 7 a 8 a 9 a 10 =128 6 .如果设数列{a n }的前n项和为S n ,那么S n =( )A.
5 n -4
B.
4 n -3
C.
3 n -2
D.
2 n -1
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