E
Editor
Sep 18, 2022
The middle terms in the expansion $(3x-\frac{x^{3}}{6})^{9}$ is
Difficulty: Easy
A:
$-\frac{27}{26}x^{27}$
B:
$-\frac{21}{17}x^{17}$
C:
$\frac{25}{2}x^{6}$
D:
$-\frac{21}{16}x^{19}$
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ID: 63273db9ca83163ac3a1176f