p(a or b)
probability of rolling a 1 or a 6 on the die
1/6+1/6= 1/3
probability I flip a coin, and it lands on tales and role an old number on a die
1/2x1/2= 1/4
probability of rolling a number less then 4 or a 1 on a die
1/6+1/6+1/6-1/6= 2/6
probability of rolling an odd on a die and flipping a coin and it lands on heads
1/2 x 1/2= 1/4
probability of getting king or a diamond in a deck of cards
13/52+4/52-1/52= 16/52
rolling a even number on a die and picking a 4 out of a deck
1/2 x 1/13=1/26
probability of picking a card less than jack or a 4
36/52+4/52-4/52= 36/52
rolling a 6 on a die or flipping a coin and it lands on heads
1/6 x 1/2= 1/12
probability of rolling a number below 5 or an odd number
4/6+3/6-3/6= 4/6
rolling a 3 or a 2 on a die and flipping a coin and landing on tales
1/3 x 1/2 = 1/6