10 cards with one integer between 1 and 5 written on them are inserted into a bag. Each integer will be written on two cards each. Two cards are taken from the bag, the first one takes the tens place, and the second one takes the ones place to create a two-digit-number.
If the probability for any card to be taken out of the bag is equal, answer the following;
(i) What is the probability for the two digits to be different integers?
(ii) What is the probability for the number to be less than 20?
(iii) What is the probability for the number to be a multiple of three?
I'm going to be completely honest here and say I have no clue how to even get started on this one >_<
Any input greatly appreciated.