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prompt "Ingrese su número de tarjeta" Validar datos Si (cardNumber es undefined) { return false } Si (cardNumber contiene letras) { return false } Si (cardNumber esta vacío)} return false

Crear variable para guardar datos a = []

for (var i = cardNumberStr.length - 1; i >= 0 ; i--) { a.push(charAt) }

for (var j = 1; j < digits.length; j+=2) { Seleccionar las posiciones pares a[j] = a[j] * 2 Si el numero es mayor a 10 a >= 10 a -= 9

a suma = a

Diagrama de Flujo de Stephanie Wong

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