If a = 2b, then a:b = ____.

If a:b=2:3, then the value of (5a^(3)-2a^(2)b):(3ab^(2)-b^(3)) is :

Factorise the following : a^3 - a^2b^2 - ab + b^3 .

Find the values of the following polynomials at a = -2 and b = 3 : a^2 + b^2 - ab- b^2-a^2

If log_(2)7= a and log_(3)2=b ," then the value of log_(14)84 is : (A) (1+3b+2ab)/(ab-b) (B) (1+2b+ab)/(b+ab) (C) (1+a+b)/(a+b) (D) (1+b+ab)/(a+ab)