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Editor
 Sep 18, 2022
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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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NETNUST Entry TestMathematicsMathematical Induction and Binomial Theorem