## Question 1
**(Select all that apply.)** Which options are valid palindromes that can be made using the letters in the string given below?

string = “abbjhhrrssS”
### Options

1. "rhbsSsbhr"
Correct
This is a valid palindrome, and all of the letters used occur with the same or greater frequency in the original string.
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2. "bhrsjsjsrhb”
Incorrect
The original string has only one 'j'.
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3. "bhrsSsrhb"
Correct
This is a valid palindrome, and all of the letters used occur with the same or greater frequency in the original string.
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4. "SsrhbjbhrsS"
Incorrect
The original string has only one occurrence of 'S'.
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## Question 2
**(Select all that apply.)** Which options are valid palindromes that can be made using the letters in the string given below?

string = "abbbhhejjssktaoop"
### Options

1. "abbkjajbbba"
Incorrect
This is not a valid palindrome.
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2. "obshaahsbo"
Correct
This is a valid palindrome, and all of the letters used occur with the same or greater frequency in the original string.
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3. "ahheejjskksjjehha"
Incorrect
This is not a valid palindrome.
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4. "osjabbbajso"
Correct
This is a valid palindrome, and all of the letters used occur with the same or greater frequency in the original string.
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## Question 3
What is the length of the longest palindrome that you can make using the letters in the string below?

string = "abccccdddeeeeeeff"
### Options

1. 15
Correct
One of the longest palindromes that can be constructed is “fccdeeedeeedccf”, whose length is 15.
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2. 12
Incorrect
We can use more than 12 characters from the original string to make valid palindromes.
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3. 13
Incorrect
We can use more than 13 characters from the original string to make valid palindromes.
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## Question 4
What is the length of the longest palindrome that you can make using the letters in the string below?

string = "xyyyyxxz"
### Options

1. 5
Incorrect
We can use more than five characters from the original string to make valid palindromes.
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2. 7
Correct
One of the longest palindromes that can be constructed is “yyxxxyy”, whose length is seven.
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3. 8
Incorrect
All eight characters from the original string may not be included in any valid palindrome.
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