series-1

 1

1 2

1 2 3

1 2 3 4

//short cut way

class series

{

public static void main(String args[])

{

for(int r=1;r<=4;r++)

{

for (int c=1 ; c<=r ; c++)

{

System.out.print(c+ "  ");

}

System.out.println() // to come to next line

}

}

}

// common way

class series

{

public static void main(String args[])

{

int a=1, d=1;   //  a- means first value  d- means how many element in first line

for(int r=1;r<=4;r++)

{

  a=1;

for (int c=1 ; c<=d ; c++)

{

System.out.print(a+ "  ");

a++;

}

d++;

System.out.println() // to come to next line

}

}

}