"In the expansion of `(x+a)^n`  if the sum of odd terms is `P`  and the sum of even terms is `Q ,`
Channel: Doubtnut
Date: 2020-06-28

"In the expansion of `(x+a)^n`
 
 if the sum of odd terms is `P`
 
 and the sum of even terms is `Q ,`
 
 then
 
 (a)`P^2-Q^2=(x^2-a^2)^n`
 
 
 
 (b)`4P Q=(x+a)^(2n)-(x-a)^(2n)`
 
 
 
 (c)`2(P^2+Q^2)=(x+a)^(2n)+(x-a)^(2n)`
 
 
 
 (d)none of these"