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Fatal error: Uncaught TypeError: multiplicar(): Argument #1 ($a) must be of type int, null given, called in /var/www/html/clases24_25/Tema 2/Funciones/arrayFunciones.php on line 12 and defined in /var/www/html/clases24_25/Tema 2/Funciones/biblioteca.php:10 Stack trace: #0 /var/www/html/clases24_25/Tema 2/Funciones/arrayFunciones.php(12): multiplicar() #1 {main} thrown in /var/www/html/clases24_25/Tema 2/Funciones/biblioteca.php on line 10