If `(3x-1)^7=a_7x^7+a_6x^6+...+a_1x+a_0` then `a_7+a_6+...+a_1+a_0=`

If (3x-1)^7=a_7x^7+a_6x^6+a_5x^5+....+a_1x+a_0 then the value of a_7 + a_6. . . . . . .a_0 =

If (1+x)(1+x+x^2)(1+x+x^2+x^3)……(1+x+x^2+……+x^(n-1)) = a_0 + a_1x + a_2x^2 +…….+a_m x^m then a_0 +a_1 + …..+ a_m =

If (1+x)^n=a_0+a_1x+a_2x^2+....+a_nx^n , then (a_0-a_2+.....)^2+(a_1-a_3+.....)^2 is equal to (A) 3^n (B) 2^n (C) ((1-2^n)/(1+2^n)) (D) none of these

If (1 +x+x^2)^25 = a_0 + a_1x+ a_2x^2 +..... + a_50.x^50 then a_0 + a_2 + a_4 + ... + a_50 is :

If (1 +x+x^2)^25 = a_0 + a_1x+ a_2x^2 +..... + a_50.x^50 then a_0 + a_2 + a_4 + ... + a_50 is :

(1 + x+x^2)^8 = a_0 + a_1x +…….+a_16 x^16 then a_1 - a_3 + a_5- a_7 + ……..-a_15=

(1 + x+x^2)^8 = a_0 + a_1x +…….+a_16 x^16 then a_0 - a_2 + a_4 - a_6 + ……..+a_16 =

If (1+2x +3x^2)^10 = a_0 +a_1x +a_2x^2 + ……+a_20x^20 then a_2/a_1 =

If (1+x+2x^2)^20 = a_0+a_1x+a_2x^2+. . . +a_40x^40 then a_1+a_3+a_5+ . . . +a_37=