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The famous Ishango bone (~20,000 BCE) is mathematically remarkable because it contains tallies grouped into:
ARandom numbers
BEven numbers only
CThe PRIME NUMBERS 11, 13, 17 and 19
DPowers of 2
Answer & Solution
Correct answer: C. The PRIME NUMBERS 11, 13, 17 and 19
One column of the Ishango bone groups notches into 11, 13, 17, 19 — exactly the prime numbers between 10 and 20. This is one of the earliest indications that the abstract concept of 'prime' was understood by humans tens of thousands of years ago. Another column shows doubling (multiplication by 2).
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