Given that ABCD is four different integers, (A-1) (B-1) (C-1) (D-1) = 4, find the value of a + B + C + D

ABCD is four different integers, so, (A-1) (B-1) (C-1) (D-1) is also four different integers,
Its product is equal to 4, only one possibility is to multiply the four numbers 1, 2 - 2 - 1
So the four integers are - 10 2 3
a+b+c+d=4

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