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7.Binomial Theorem
hard
$\sum\limits_{m = 0}^{100} {{\,^{100}}{C_m}{{(x - 3)}^{100 - m}}} {.2^m}$ के विस्तार में ${x^{53}}$ का गुणांक है
A
$^{100}{C_{47}}$
B
$^{100}{C_{53}}$
C
${ - ^{100}}{C_{53}}$
D
${ - ^{100}}{C_{100}}$
Solution
दिया गया व्यंजक है
${[(x – 3) + 2]^{100}} = {(x – 1)^{100}} = {(1 – x)^{100}}$.
$\therefore {x^{53}}$, ${T_{54}}$में आएगा
${T_{54}} = {\,^{100}}{C_{53}}{( – x)^{53}}$
$\therefore$ गुणांक $-^{100}C_{53}$. है।
Standard 11
Mathematics