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3.B
//'main' method must be in a class 'Rextester'. //openjdk version '11.0.5' // Razak-7051 import java.util.*; import java.lang.*; class Rextester { public static void main(String args[]) { int n; int sum; Scanner in = new Scanner(System.in); System.out.println("Enter the number:\n"); n=in.nextInt(); sum=0; for(int i=1;i<=n;i++) { sum+=i; } System.out.println("The sum of numbers up to "+n+" is :"+sum); } }
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