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+# Description 
+In this code, a triangle pattern will be formed using for loop
+
+# Code
+```
+#include <iostream>
+using namespace std;
+
+int main() {
+    int i, j, n;
+    cin >> n;
+    for (i = 1; i <= n; i++) {
+        int a = i;
+        for (j = 1; j <= n - i; j++) {
+            cout << "  ";
+        }
+        for (j = 1; j <= i; j++) {
+            cout << a << " ";
+            a++;
+        }
+        for (j = 1; j < i; j++) {
+            a--;
+            cout << a - 1 << " ";
+        }
+        cout << endl;
+    }
+    return 0;
+}
+```
+# Test Cases
+```
+Sample-Test case 1:
+
+Input: 5
+Output:
+        1 
+      2 3 2 
+    3 4 5 4 3 
+  4 5 6 7 6 5 4 
+5 6 7 8 9 8 7 6 5 
+
+Sample-Test case 2:
+
+Input: 3
+Output:
+    1
+  2 3 2
+3 4 5 4 3
+```