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Suppose a “Secret Pair” number is a four-digit number in which two adjacent digits are equal and the other two digits are not equal to either one of that pair or each other. For example, 2209 and 1600 are “Secret Pair” numbers, but 1333 or 2552 are not. How many “Secret Pair” numbers are there?
(A) 720
(B) 1440
(C) 1800
(D) 1944
(E) 2160
[spoiler]OA=D[/spoiler]
Source: Magoosh
(A) 720
(B) 1440
(C) 1800
(D) 1944
(E) 2160
[spoiler]OA=D[/spoiler]
Source: Magoosh
