7.Binomial Theorem
easy

${\left( {x - \frac{1}{x}} \right)^{18}}$ के प्रसार में मध्य पद है  

A

$^{18}{C_9}$

B

${ - ^{18}}{C_9}$

C

$^{18}{C_0}$

D

${ - ^{18}}{C_{10}}$

Solution

चूँकि $n$ सम है

$\therefore $ $10$ वां पद मध्य पद है

${T_{10}} = {}^{18}{C_9}{(x)^9}.\,{\left( { – \frac{1}{x}} \right)^9} = {\rm{ }} – {}^{18}{C_9}$.

Standard 11
Mathematics

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