Re: HSC 2016 3U Marathon
3! x 3! is ordering the vowels and consonants as separate groups. You then multiply this by 12 as this is the possible number of arrangements of the two groups, as follows:
xx_x__
xx__x_
xx___x
_xx_x_
_xx__x
x_xx__
__xx_x
x__xx_
_x_xx_
x___xx
_x__xx
__x_xx
Pretty...