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espero q te sirva
Del enunciado
a1 = 65
an = 95
r = 5
n = ??
En toda PA
an = a1 + (n - 1).r
Luego
95 = 65 + (n - 1).5
(95 - 65)/5 = n - 1
6 = n - 1
n = 7
Hay 7 múltiplos