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Main.java
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Main.java
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import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the value of n: ");
int n = scanner.nextInt();
System.out.print("Enter the value of r: ");
int r = scanner.nextInt();
// Check n >= r
if (n < r) {
System.out.println("Invalid input");
}
// Check n >= 0
else if (n < 0) {
System.out.println("Invalid input");
}
// Check r >= 0
else if (r < 0) {
System.out.println("Invalid input");
}
// Calculate nCr
int nCr = factorial(n) / (factorial(r) * factorial(n - r));
// Display the result
System.out.println("nCr = " + nCr);
// Close the scanner
scanner.close();
}
// Calculate factorial
public static int factorial(int n) {
int result = 1;
for (int i = 2; i <= n; ++i) {
result *= i;
}
return result;
}
}