7.Binomial Theorem
medium

${\left( {2{x^2} - \frac{1}{{3{x^2}}}} \right)^{10}}$ के प्रसार में $6$ वां पद होगा   

A

$\frac{{4580}}{{17}}$

B

$ - \frac{{896}}{{27}}$

C

$\frac{{5580}}{{17}}$

D

इनमें से कोई नहीं

Solution

${T_{r + 1}} = {\,^n}{C_r}{x^{n – r}}{a^r}$, ${(x + a)^n}$ के लिए

अत: ${T_6} = {\,^{10}}{C_5}{(2{x^2})^5}{\left( { – \frac{1}{{3{x^2}}}} \right)^5}$

  $ =  – \frac{{10\,!}}{{5\,!\,5\,!}}32 \times \frac{1}{{243}} =  – \frac{{896}}{{27}}$

Standard 11
Mathematics

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