7.Binomial Theorem
medium

જો ${(x - 2y + 3z)^n}$ ના સહગુણકોનો સરવાળો $128$ હોય તો ${(1 + x)^n}$ ના વિસ્તરણમાં મહતમ સહગુણક મેળવો.

A

$35$

B

$20$

C

$10$

D

એકપણ નહિ.

Solution

(a) Sum of the coefficient in the expansion ${(x – 2y + 3z)^n}$ is ${(1 – 2 + 3)^2}$=$ {2^n}$

${2^n}$=$ 128$ 

$\Rightarrow n = 7$

Therefore, greatest coefficient in the expansion of ${(1 + x)^7}$is $^7{C_3}$or $^7{C_4}$ because both are equal to $35.$

Standard 11
Mathematics

Similar Questions

Start a Free Trial Now

Confusing about what to choose? Our team will schedule a demo shortly.