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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