A palindrome is a word or a number that reads the same forward and backward. For example, 2442 and 111 are palindromes. If 5-digit palindromes are formed using one or more of the digits 1 and 2, how many palindromes are possible? Choose the correct choice from the following choices.
A) 8  B) 12  C) 16  D) 24  E) 32
There are 2 choices for each of the first three digits.   The number of possible palindromes is 2^3=8.   The answer is 8.
<result>A</result>
A palindrome is a word or a number that reads the same forward and backward. For example, 2442 and 111 are palindromes. If 5-digit palindromes are formed using one or more of the digits 1 and 2, how many palindromes are possible?