7.Binomial Theorem
normal

The sum of the binomial coefficients of ${\left[ {2\,x\,\, + \,\,\frac{1}{x}} \right]^n}$ is equal to $256$ . The constant term in the expansion is

A

$1120$

B

$2110$

C

$1210$

D

none

Solution

$ C_0 + C_1 + C_2 + ……… C_n = 250$

$ \Rightarrow 2^n = 2^8 \Rightarrow n = 8$

Standard 11
Mathematics

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