They were small stones or pebbles - called calculus (pl = calculi).
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the #1 is the 1st counting #. the #1 believe me
The sum of the first six counting numbers (1-6) is 19.
Abacus
ABACUS
product = 6 first three positive counting numbers = 1, 2, 3product of the first three positive counting numbers:1 x 2 x 3 = 6