diff --git a/C/program-51/README.md b/C/program-51/README.md
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+Program 51
+
+Write an program to print duplicates in an array.
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diff --git a/C/program-51/program.c b/C/program-51/program.c
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+++ b/C/program-51/program.c
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+#include <stdio.h>
+
+int main() {
+    int arr[100],freq[100];
+    int n,i;
+    printf("Enter the number of elements in array \n");
+    scanf("%d",&n);
+    printf("Enter elements in the array \n");
+    for(i=0;i<n;i++)
+    {
+        scanf("%d",&arr[i]);
+        freq[arr[i]]++;
+    }
+    for(i=0;i<n;i++)
+    {
+        if(freq[i]>1)
+        printf("%d ",i);
+    }
+    printf("\n");
+}
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