A palindrome is a number that reads the same forward and backward

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A palindrome is 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, 2, 3, how many such palindromes are possible?

A、12.0
B、15.0
C、18.0
D、24.0
E、27.0

答案：E

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