Respuesta:
19
Explicación paso a paso:
[tex]Numero/de/terminos= (\frac{a_{n}-a_{1} }{r})+1\\\\Entonces:\\(\frac{72-18}{3})+1\\ (\frac{54}{3})+1\\18+1\\19[/tex]
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Respuesta:
19
Explicación paso a paso:
[tex]Numero/de/terminos= (\frac{a_{n}-a_{1} }{r})+1\\\\Entonces:\\(\frac{72-18}{3})+1\\ (\frac{54}{3})+1\\18+1\\19[/tex]