From d460995efca684d5e120b2718793330b7376c67f Mon Sep 17 00:00:00 2001
From: Philasarts <165176234+PhilsC8@users.noreply.github.com>
Date: Wed, 5 Jun 2024 21:10:03 +0000
Subject: [PATCH] third commit

---
 .../clsEstructuraDiscretas/pry4/Formulas.java | 34 +++++++++++++++++--
 1 file changed, 31 insertions(+), 3 deletions(-)

diff --git a/src/main/java/com/utp/clsEstructuraDiscretas/pry4/Formulas.java b/src/main/java/com/utp/clsEstructuraDiscretas/pry4/Formulas.java
index 090c795..9e2d71a 100644
--- 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) {