Hi! Can somebody explain me please how to solve these:

a) Calculate the probability of getTing at least one die showing a 5 using two dices?

b) Calculate the prob. of getting the sum 10 and none of the dices are showing a 5?

C) Calculate the prob. of getting two 5 if you may roll twice? That is if one of the dices doesn't show a 5 this one a second time and if none of the dices are showing a 5 you role both.

(Sleepy)