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\(\{a, b, 1, 2\}\)
If \(a\) and \(b\) are positive integers less than 10, what is the mode of the list above?
(1) The number of different permutations of the numbers in the list is 12.
(2) A four-digit number \(21ab\) is divisible by 9
[spoiler]OA=E[/spoiler]
Source: GMAT Club Tests
If \(a\) and \(b\) are positive integers less than 10, what is the mode of the list above?
(1) The number of different permutations of the numbers in the list is 12.
(2) A four-digit number \(21ab\) is divisible by 9
[spoiler]OA=E[/spoiler]
Source: GMAT Club Tests
