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7.Binomial Theorem
easy
${(x + 3)^6}$ ના વિસ્તરણમાં ${x^5}$ નો સહગુણક મેળવો.
A
$18$
B
$6$
C
$12$
D
$10$
Solution
(a) ${T_{r + 1}} = {}^6{C_r}{x^{6 – r}}{3^r}$
This contains ${x^5}$ if $6 -r = 5 $ $\Rightarrow r = 1$
Coefficient of ${x^5}{ = ^6}{C_1}{3^1} = 18.$
Standard 11
Mathematics