Im not sure but this is how i understood it, this is the first time im looking at it
SO the first three colas are next to each other, [CCC]
lets just let that be one big C, green tea = G, oranje juice = J
there are only three different places we can place the G:
1) G C G J J 2) G C J G J 3) G C J J G
hence the 3
note that the Gs can not be moved the only thing we can move is C J J hence 3! = 4x3/2
therefore 3x3!=18 or as the mark sceme 3x(4x3/2)
hope i helped
, good luck everyone im out for the night!