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

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