AMC 10B 2009 Problem 11

Past Contests AMC 10 2009 Part B
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1

How many 7 digit palindromes (numbers that read the same backward as forward) can be formed using the digits 2,2,3,3,5,5,5 ?

Answer Choices
A. 6
B. 12
C. 24
D. 36
E. 48