This little teasers is in two parts. The first is easy, but can you get the second part right?

Part1.
Two players get all in pre flop.
Player A holds Ac,7d
Player B holds Kd,Qh

Who has the better chance of winning the pot?

Part2.

Now the trickier one
The same as before, except now we have a third player all in.

So three players get all in pre flop.
Player A holds Ac,7d
Player B holds Kd,Qh
Player C holds 5d,5h

Now who has the better chance of winning that pot?