[" 71."sum_(i=0)^(30)a_(r)x'=(1+x+x^(2)+x^(3))^(100)." If "a=sum_(r=0)^(300)a_(r)," then "sum_(r=0)^(300)r_(0)],[" equal to "]

sum_(r=0)^(300)a_(r)x^(r)=(1+x+x^(2)+x^(3))^(100) ,If a=sum_(r=0)^(300)a_(r), then sum_(r=0)^(300)ra_(r)

sum_(r=0)^(300)a_(r)x^(r)=(1+x+x^(2)+x^(3))^(100). If a=sum_(r=0)^(300)a_(r), then sum_(r=0)^(300)ra_(r) is equal to 300a b.100a c.150a d.75a

sum_(r=0)^(300)a_rx^r=(1+x+x^2+x^3)^(100) . If a=sum_(r=0)^(300)a_r , then sum_(r=0)^(300)ra_r is equal to

If (1+x^(2))^(n) =sum_(r=0)^(n) a_(r)x^(r )= (1+x+x^(2)+x^(3))^(100) . If a = sum_(r=0)^(300)a_(r) , then sum_(r=0)^(300) ra_(r) is

If sum_(r=1)^(n)Cos^(-1)x_(r)=0," then "sum_(r=1)^(n)x_(r) equals to

sum_(r=0)^(300)a_r x^r=(1+x+x^2+x^3)^(100)dot If a=sum_(r=0)^(300)a_r ,t h e nsum_(r=0)^(300)r a_r is equal to 300 a b. 100 a c. 150 a d. 75 a

If sum_(r=1)^(n)cos^(-1)x_(r)=0, then sum_(r=1)^(n)x_(r) equals to

If a_(n)=sum_(r=0)^(n)(1)/(nC_(r)), then sum_(r=0)^(n)(r)/(nC_(r)) equals

If (1+2x+x^(2))^(n) = sum_(r=0)^(2n)a_(r)x^(r) , then a_(r) =

If (1+2x+x^(2))^(n) = sum_(r=0)^(2n)a_(r)x^(r) , then a_(r) =