I Just got given homework on things i don't get.

Here are a few questions i'm stuck on:

Brock has 48 books in his bookcase and 15 of the books are novels. Calculate the probability that of the first 2 books chosen at random for reading (assuming the same book is not chosen twice) that at least one of them is a novel.

Probability can be used to determine if a gambling game is fair (ie. A fair game is when the cost is equal to the expected winnings)

EX(winnings)=P(winning)x$amount won

Expected winnings = Probability of winning x value of prize

a) If chloe pays $10 to play a game in which she rolls two dice and the sum of the dice is her scroe, determine if this is a fair game if she wins $50 whenever she rolls a 7

b) Jack was offered the opportunity to play any number of games. In each case he pays $10 to play and roll a pair of dice.

GAME 1 - if the sum of the numbers is even jack receives $20

GAME 2 - if the sum of the numbers is 6 or 8 jack receives $30

GAME 3 - if the sum of the numbers is 5 or less Jak receives $40

Which Game/s should Jack choose to play? fully justify your answer by comparing all 4 games.

Thanks to anyone that helps, also i would rather an explanation on how to do it then just an answer. Although how to do it and an answer would be great!