D'Alembert's Ratio Test of Convergence of Series: The d'Alembert ratio test was established by mathematician Jean le Rond d'Alembert in 1768 to test the convergence of an infinite series. The test involves taking the limit of the ratio of consecutive terms in a series; if this limit is less than 1, the series converges, and if it is greater than 1, it diverges. #maths #usa #italia #germany #india #Pakistan #belgium #italy #canada #mexico #argentina #brasil #California #Texas #Florida #NewYork #P