Can anyone help with this?
p(liquorice+mint) = (12/20)*(5/19)
p(liquorice+humbug) = (12/20)*(3/19)
p(mint+humbug) = (5/20)*(3/19)
sum the above to fiind the total probability: (12*5 + 12*3 + 5*3)/(20*19)
I'll leave you to crunch the numbers.