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The Hawaiian language has 12 letters: five vowels and seven consonants. Each of the 12 Hawaiian letters is written on a slip of paper and placed in a bag. A letter is randomly chosen from the bag and then replaced. Then, a second letter is randomly chosen from the bag.

What is the probability that two vowels are chosen?

A. [tex]$\frac{5}{72}$[/tex]
B. [tex]$\frac{25}{144}$[/tex]
C. [tex]$\frac{7}{12}$[/tex]
D. [tex]$\frac{5}{6}$[/tex]


Sagot :

To solve for the probability of choosing two vowels from a bag containing 12 Hawaiian letters (5 of which are vowels) where each letter is replaced before the next pick, we can follow these steps:

1. Determine the probability of choosing a vowel on the first pick:
- There are 5 vowels and a total of 12 letters.
- Therefore, the probability of picking a vowel on the first draw is:
[tex]\[ \frac{5}{12} \][/tex]

2. Determine the probability of choosing a vowel on the second pick:
- Since the letter is replaced, the scenario remains the same for the second draw.
- Thus, the probability of picking a vowel again is also:
[tex]\[ \frac{5}{12} \][/tex]

3. Calculate the combined probability of both events happening (choosing a vowel on the first pick AND a vowel on the second pick):
- Since these are independent events (because of replacement), we multiply the probabilities of the individual events:
[tex]\[ \left( \frac{5}{12} \right) \times \left( \frac{5}{12} \right) \][/tex]
[tex]\[ \frac{5}{12} \times \frac{5}{12} = \frac{25}{144} \][/tex]

Therefore, the probability that two vowels are chosen is:
[tex]\[ \boxed{\frac{25}{144}} \][/tex]

By comparing this with the given options, we see that our answer matches option (b) [tex]$\frac{25}{144}$[/tex].