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package exe4_Methods;
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import java.util.Scanner;
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public class prob8_Factorial_Division {
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    public static void main(String[] args) {
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        Scanner scanner = new Scanner(System.in);
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        int num1 = Integer.parseInt(scanner.nextLine());
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        int num2 = Integer.parseInt(scanner.nextLine());
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        int factorialNum1 = getFactorial(num1);
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        int factorialNum2 = getFactorial(num2);
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        double divisionFactorials = 1.0 * factorialNum1 / factorialNum2;
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        System.out.printf("%.2f", divisionFactorials);
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    }
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    private static int getFactorial(int numbers) {
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        int factorial = 1;
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        for (int j = numbers; j >= 1; j--) {
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            factorial *= j;
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        }
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        return factorial;
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    }
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}
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