Given that a, B, C and D are mutually unequal integers, and ABCD = 9, then the value of a + B + C + D is equal to () A. 0b. 4C. 8D
The four numbers are less than or equal to 9, and they are not equal to each other. From the product of 9, there must be 3 and - 3 in the four numbers. The four numbers are: 1, - 1, 3, - 3, and the sum is 0
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