Kevin has an equal number of quarters nickels and dimes in his piggy bank, he randomly picks a coin replaces it and picks another coin. What is the probability that the sum of the two coins picked is at least thirty cents

Answer 1

P(q) = 1/3
P(n|d,q) = 2/9
P(n|d,n|d) = 4/9

So, what do you think?

the 1st probability means that if the 1st coin is a quarter, the 2nd does not matter.

Answer 2

q q *
- n *
- d *

n q *
- n :(
- d :(

d q *
- n :(
- d :(
so
5/9

Answer 3

100./.

Answer 4

I think it is A or D