Question 256261
1st pick p = 1 (your are going to get a sweet and it doesn't matter which colour)
2nd pick p= 12/15 anything but 1st colour (of which 3 are left)
3rd pick p = 8/14 two colours left out of 4
4th p = 4/13
So probability is = 1 x 12/15 x 8/14 x 4/13 = 64/(5 x 7 x 13)= 64/455