The arithmetic triangle is used to determine binomial coefficients \( { (a+b)^n } \) when calculating the number of possible combinations of k objects out of a total of n objects (C n k).
HISTORY
The notion of finding the number of combinations of k objects from n objects in total has been explored in India since the ninth century. Indeed, there are traces of it in the Meru Prastara written by Pingala in around 200 BC.
Between the fourteenth and the fifteenth centuries, al-Kashi, a mathematician from the Iranian city of Kashan, wrote The Key to Arithmetic. In this work he calls binomial coefficients “exponent elements”.
In his work Traité du Triangle Arithmétique, published in 1665, Pascal, Blaise (1654) defined the numbers in the “arithmetic triangle”, and so this triangle is also known as Pascal's triangle.
We should also note that the triangle was made popular by Tartaglia, Niccolo Fontana in 1556, and so Italians often refer to it as Tartaglia's triangle, even though Tartaglia...
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REFERENCES
Pascal, B.: Traité du triangle arithmétique (publ. posthum. in 1665), Paris (1654)
Pascal, B.: Œuvres, vols. 1–14. Brunschvicg, L., Boutroux, P., Gazier, F. (eds.) Les Grands Ecrivains de France. Hachette, Paris (1904–1925)
Pascal, B., Mesnard, J. (ed.): Œuvres complètes. Vol. 2. Desclée de Brouwer, Paris (1970)
Rashed, R.: La naissance de l'algèbre. In: Noël, E. (ed.) Le Matin des Mathématiciens, Chap. 12. Belin-Radio France, Paris (1985)
Youschkevitch, A.P.: Les mathématiques arabes (VIIIème-XVème siècles). Partial translation by Cazenave, M., Jaouiche, K. Vrin, Paris (1976)
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(2008). Arithmetic Triangle. In: The Concise Encyclopedia of Statistics. Springer, New York, NY. https://doi.org/10.1007/978-0-387-32833-1_13
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