**Missing Number in Java**

**Output: 6**

**source code: **

import java.io.*;

import java.util.*;

class Missno

{

public static void main(String arg[ ])

{

Scanner obj=new Scanner(System.in);

System.out.println(“enter n value”);

int n=obj.nextInt();

int sum=0;

int c,i,a[]=new int[n];;

System.out.println(“enter values”);

for(i=0;i<n-1;i++)

{

a[i]=obj.nextInt();

sum=sum+a[i];

}

c=(n*(n+1)/2)-sum;

System.out.println(“missing no is”+c);

}

}

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