alleryIn ancient Chinese counting rods, what colour marked positive numbers?
ABlack
BWhite
CRed
DGreen
Answer & Solution
Correct answer: C. Red
1. The Chinese used two kinds of counting rods for gains and losses.
2. Red rods stood for positive numbers.
3. Black rods stood for negative numbers, so black is wrong.
_Source: Wikipedia, Negative number, History_
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