One of the following is a recursive definition of the set of bit strings that ar

ID: 3012174 • Letter: O

Question

One of the following is a recursive definition of the set of bit strings that are palindromes. There are two types of palindromes, so we need two base cases, namely lambda is a palindrome, and x is a palindrome for every symbol x. The recursive step is that if alpha is a palindrome and x is a symbol, then x alpha x is a palindrome. There is only one palindrome, so we need only one base case, namely lambda is a palindrome, and x is the only palindrome for every symbol x. The definition is impossible to be formed. There are two types of palindromes, so we need two base cases, namely lambda is a palindrome, and x is a palindrome for every symbol x. The recursive step is that if alpha is a palindrome and x is a symbol, then x alpha x is NOT a palindrome.

Explanation / Answer

The empty string is a palindrome. All strings with one character are palindromes. All strings of the form cwc are palindromes, where c is a character and w is a palindrome.

hence option A) is correct

Navigate

One of the following functional groups sometimes shows a single weak to medium I

One of the following is incorrect, when the degree of crystalline of a polymer i

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.

One of the following is a recursive definition of the set of bit strings that ar

Question

Explanation / Answer

Related Questions

Navigate