third commit

Laifsyn · Jun 5, 2024 · d460995 · d460995
1 parent 260a682
commit d460995
Showing 1 changed file with 31 additions and 3 deletions.
diff --git a/src/main/java/com/utp/clsEstructuraDiscretas/pry4/Formulas.java b/src/main/java/com/utp/clsEstructuraDiscretas/pry4/Formulas.java
@@ -6,19 +6,47 @@
 
 public class Formulas {
 
+    private static BigInteger factorial(int n) {
+        if (n == 0) {
+            return BigInteger.ONE;
+        }
+        BigInteger result = BigInteger.ONE;
+        for (int i = 1; i <= n; i++) {
+            result = result.multiply(BigInteger.valueOf(i));
+        }
+        return result;
+    }
     public static Result<BigInteger, Exception> Comb_sin_repeticion(String[] args) {
         var this_function = new Object() {}.getClass().getEnclosingMethod().getName();
-        return Result.error(new UnsupportedOperationException(this_function + " aun no esta listo."));
+        try {
+            int n = Integer.parseInt(args[0]);
+            int r = Integer.parseInt(args[1]);
+            return Result.ok(factorial(n).divide(factorial(r).multiply(factorial(n - r))));
+        } catch (Exception e) {
+            return Result.error(e);
+        }
     }
 
     public static Result<BigInteger, Exception> Comb_con_repeticion(String[] args) {
         var this_function = new Object() {}.getClass().getEnclosingMethod().getName();
-        return Result.error(new UnsupportedOperationException(this_function + " Not supported yet."));
+        try {
+            int n = Integer.parseInt(args[0]);
+            int r = Integer.parseInt(args[1]);
+            return Result.ok(factorial(n + r - 1).divide(factorial(r).multiply(factorial(n - 1))));
+        } catch (Exception e) {
+            return Result.error(e);
+        }
     }
 
     public static Result<BigInteger, Exception> Varianza_sin_repeticion(String[] args) {
         var this_function = new Object() {}.getClass().getEnclosingMethod().getName();
-        return Result.error(new UnsupportedOperationException(this_function + " Not supported yet."));
+        try {
+            int n = Integer.parseInt(args[0]);
+            int r = Integer.parseInt(args[1]);
+            return Result.ok(factorial(n).divide(factorial(n - r)));
+        } catch (Exception e) {
+            return Result.error(e);
+        }
     }
 
     public static Result<BigInteger, Exception> Varianza_con_repeticion(String[] args) {