7.Binomial Theorem
easy

 ${\left( {x - \frac{1}{x}} \right)^7}$ के विस्तार में ${x^3}$ का गुणांक है   

A

$14$

B

$21$

C

$28$

D

$35$

Solution

$7 – 2r = 3 \Rightarrow r = 2$

$\therefore $ गुणांक =$^7{C_2} = 21$.

Standard 11
Mathematics

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