mithilesh kumar singh

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class Program

{
static void Main(string[] args)

{
int i, j,k=0;

Console.Write("Enter the number:" );

int n = Convert.ToInt32(Console.ReadLine());

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

{ for (j = 1; j <= i; j++)

{
k++;
Console.Write(k);

}
Console.WriteLine();

} Console.ReadLine();

}

}