If `(1+x-2x^2)^6=sum_(r=0)^12 a_r.x^r` then `a_1+a_3+......a_11`

(1+x-2x^(2))^(6)=sum_(r=0)^(12)a_(r)x^(r) then a_(2)+a_(4)+....+a_(12)=

"If" n in "and if "(1+ 4x +4 x^2)^n=Sigma_(r=0)^(2n) a_rx^r, "where" a_0,a_1,a_2,.....a_(2n) "are real number" The value of the 2 underset(r=1) overset (n) Sigma_(2r-1) is

"If" n in "and if "(1+ 4x +4 x^2)^n=Sigma_(r=0)^(2n) a_rx^r, "where" a_0,a_1,a_2,.....a_(2n) "are real number" The value of a_(2n-1)is

"If" n in "and if "(1+ 4x +4 x^2)^n=Sigma_(r=0)^(2n) a_rx^r, "where" a_0,a_1,a_2,.....a_(2n) "are real number" , The value of a_(2n-1) is

If (1+x-3x^(2))^(2145)=a0+a1x+a2x^(2)+... then a0-a1+a2-a3+...... ends with

if (1-x^3)^n=sum_(r=0)^n a_rx^r (1-x)^(3n-2r), where n epsilonN then find a_r .