(i(a))[2]
Find the first three terms, in ascending powers of $x$, of the expansion of $(1 - x)^6$.
(i(b))[2]
Find the first three terms, in ascending powers of $x$, of the expansion of $(1 + 2x)^6$.
(ii)[3]
Hence find the coefficient of $x^2$ from the expansion of $[(1 - x)(1 + 2x)]^6$.