My first question is:

1. Suppose the two joker cards are left in a standard deck of cards. One of the jokers is red and the other is black. A single card is drawn is from the deck of 54 cards,but not returned, and then a second card is drawn. Determine the probability of drawing the red joker or a red ace on either draw.

This is the answer my teacher told me but i have no idea how to get 51/54 or the 50/53 so can anyone please explain this to me.

1- (51/54)*(50/53)= 1- 425/477 = 52/477

2. A basketball player has a success rate of 80% for shooting free throws.

Calculate the following probabilities.

i) She will make 3 out of 5 attempts

ii)She will miss all 5

iii)She will make the first 3 and miss the next 2.

This one i have no idea how to do because we are still on condition probability so i dont kno how to do permutations or anything

My last question is this:

An airplane can make a safe landing if at least half of its engines are working. Suppose that engine failures are independant events. Determine whether a two-engine plane is safer that a four engine plane if the chance that an engine fails is 1 in 2.

i also have no idea how to do this questions either.

So please can anyone explain step by step on how to do these questions or give me a link to a site please. I really need help.