Why is the coefficient of b in (6b^2) 0?
Coefficient of 'b' in the expression 6b2 is ___.
The coefficient of x9 in the expansion of 1+x)((1+x2) (1+x3) ⋯ (1+x100) is
If the three consecutive coefficient in the
expansion of (1+x)n are 28, 56 and 70, then the
value of n is
If the coefficient of (2r+3)th and (r−3)th terms in the expansion of (1+x)18 are equal, then r =