1.

If a and b denote the sum of the coefficients in the expansions of (1-3x+10x2)n and (1 + x2)n respectively, then write the relation between a and b.

Answer»

Given :

(1-3x+10x2)n

Sum of coefficients = a

a = (1 - 3 + 10)n

=(23)n =(2n)3 (1+x2)n 

Sum of coefficients = b 

b = (1+1)n 

= 2

Put value of b in a; we get : 

a = b3



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