Answer:
Step-by-step explanation:
1)
Probability for flipping one coin is 1/2
Probability for flipping two coins should be about 1/2 * 1/2 which is 1/4
There is a 1/4 chance
2)
First you must find the sum of all the marbles which would be 20
Now, put the blue marbles over the sum of 20 which is
5/20 or simplified to 1/4 which is the probability of choosing a blue marble
3)
If the probability of landing on yellow is 4/9, whatever is left is the probability of not landing on yellow which is 5/9
