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The product of two physical quantities X and Y is Z. The representation of the absolute error in the product is __
1. ΔZ = ΔA × ΔB
2. ΔZ = ΔA + ΔB
3. ± ΔZ = ± ΔA ± ΔB
4. ΔZ = ± ΔA ÷ ΔB

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