Question

Question 4, I give thanks and 5 stars so you get more points :p Worth 15 points

Answer 1

Since gkitten wasn't sure I'll attempt this too.

a) Assuming that the bottles are not replaced from the fridge each time:
5+6+4=15
So 5/15 x 4/14 = 2/21
2/21 x 100 = 9.524%

b) So now there are only 13 bottles in the fridge:
4/13 x 3/12 = 1/13
1/13 x 100 = 7.692%

Hope I helped.

Answer 2

A) 5+6+4=15, so the chance that they will both get orange juice is 2/15
B) 15-2=13, so the chances that neither of them will pick grape juice is 6.5%

I think this is right, but you might want to check it if anyone else answers because I havn't done this in maths for a while.