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AMC 10 2020a Problem 18

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Let (a,b,c,d)(a,b,c,d) be an ordered quadruple of not necessarily distinct integers, each one of them in the set 0,1,2,3.{0,1,2,3}. For how many such quadruples is it true that a⋅d−b⋅ca\cdot d-b\cdot c is odd? (For example, (0,3,1,1)(0,3,1,1) is one such quadruple, because 0⋅1−3⋅1=−30\cdot 1-3\cdot 1 = -3 is odd.) (A) 48(B) 64(C) 96(D) 128(E) 192\textbf{(A) } 48 \textbf{(B) } 64 \textbf{(C) } 96 \textbf{(D) } 128 \textbf{(E) } 192

Dataset text NuminaMath-1.5. Quoted with source.

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96

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