Mark the correct alternative in the following :

If the sum of the binomial coefficients of the expansion is equal to 256, then the term independent of x is


Given:


Sum of binomial coefficients = 2n


=256


2n=28


n=8


so total terms = n+1


=9


Middle term = 5th term; i.e. k=4


So, term independent of



= 1120

1