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o tambien An = A1 + r(N-1)
sustituimosss y despejamos N
18/5 = 3/5 + 1/3(n-1)
18/5 - 3/5 = 1/3(n-1) restamos y pasamos el 3 del lado derecho al lado iz multiplicando
15/5 x 3
9 = n-1 pàsamos 1 sumando
n = 10 es el decimo termino