Answer:
(a) 4/9
(b) 19/27
Step-by-step explanation:
The probability of each die turning up red or not turning red are:

(a). Exactly one face up is red.
The odds of only the first die being red are:

The same odds are valid for only the second or only the third die being red. Therefore, the probability that exactly one die turns up red is:

(b). At least one face up is red.
The probability that at least one die turns up red is the sum of the probabilities of exactly one (found in the previous item), two or all dice turning up red.
Following the same logic as in the previous item, the probability that exactly two dice turn up red is:

The probability that all die turn up red is:

Thus, the probability that at least one die turns up red is:

The awnser would be 23
x 23
____
529
<u>ANSWER</u>
A. (4,12)
<u>EXPLANATION</u>
The equations are:

and

To eliminate a variable we make the coefficients of that variable the same in both equations.
It is easier to eliminate x.
We multiply the first equation by 2 to get:

We add equations (2) and (3).


Divide both sides by 23


Put x=4 into equation (1).






The solution is (4,12)
Is this the entire question?