" 23.If "(x^(2)+x+1)/(1-x)=a_(0)+a_(1)x+a_(2)x^(2)+.....," then "sum_(r=1)^(s0)a_(r)" is equal to "

If (x^(2)+x+1)/(1-x) = a_(0) + a_(1)x+a_(2)x^(2)+"…." , then sum_(r=1)^(50) a_(r) equal to

If (x^(2)+x+1)/(1-x) = a_(0) + a_(1)x+a_(2)x^(2)+"…." , then sum_(r=1)^(50) a_(r) equal to

If (x^(2)+x+1)/(1-x)=a_(0)+a_(1)x+a_(2)x^(2)+..., then sum_(r=1)^(50)a_(r) is equal to 148 b.146 c.149 d.none of these

If (x^(2)+x+1)/(1-x) = a_(0) + a_(1)x+a_(2)x^(2)+"…." , the b sum_(r=1)^(50) a_(r) equal to

If (1-x)^(-n)=a_(0)+a_(1)x+a_(2)x^(2)+...+a_(r)x^(r)+..., then a_(0)+a_(1)+a_(2)+...+a_(r) is equal to (n(n+1)(n+2)...(n+r))/(r!)((n+1)(n+2)...(n+r))/(r!)(n(n+1)(n+2)...(n+r-1))/(r!) none of these

If (2+x+x^(2))^(10)=a_(0)+a_(1)x+a_(2)x^(2)+......+a_(20)x^(20) then (a_(1)-a_(0))/(a_(20))=

Let (x+10)^(50)+(x-10)^(50)=a_(0)+a_(1)x+a_(2)x^(2)+...+a_(50)x^(50) for all x in R , then (a_(2))/(a_(0)) is equal to