For any numbers a and b, a • b = ab(3 – b). If a and a • b both represent positive numbers, which of the following could be a value of b?

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For any numbers <em>a</em> and <em>b, a</em> • <em>b</em> = <em>ab</em>(3 – <em>b</em>). If <em>a</em> and <em>a</em> • <em>b</em> both represent positive numbers, which of the following could be a value of <em>b</em>?