If a and b denote the sum of the coefficients in the expansions of 
and 
respectively, then write the relation between a and b.
Given:
(1-3x+10x2)n
Sum of coefficients = a
a 
=(23)n
=(2n)3
(1+x2)n
Sum of coefficients = b
b= (1+1)n
=2n
Put value of b in a; we get:
a=b3
1