alleryError in product Q = A × B with relative errors a and b:
Aa + b (relative errors add)
Ba - b
CCannot determine
Da × b
Answer & Solution
Correct answer: A. a + b (relative errors add)
For Q = AB: ΔQ/Q = ΔA/A + ΔB/B (for small errors).
**General rule:** in products/quotients, RELATIVE errors add.
In sums/differences, ABSOLUTE errors add.
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