7.Binomial Theorem
hard

${(1 + {t^2})^{12}}(1 + {t^{12}})\,(1 + {t^{24}})$ के विस्तार में ${t^{24}}$ का गुणांक होगा

A

$^{12}{C_6} + 2$

B

$^{12}{C_5}$

C

$^{12}{C_6}$

D

$^{12}{C_7}$

(IIT-2003)

Solution

${(1 + {t^2})^{12}}(1 + {t^{12}})(1 + {t^{24}})$

= $(1 + {}^{12}{C_1}{t^2} + {}^{12}{C_2}{t^4} + …{ + ^{12}}{C_4}{t^8} + …{ + ^{12}}{C_{10}}{t^{20}} + ….)$

$(1 + {t^{12}} + {t^{24}} + {t^{36}})$

 $\therefore {t^{24}}$ का गुणांक ${ = ^{12}}{C_6} + 2.$

Standard 11
Mathematics

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