https://gateoverflow.in/91199/gate1989-12a
I THINK ALL THE SOLUTIONS ARE WRONG WHICH ARE PRESENTED THERE.
AND MY MAIN DOUBT IS THEY ARE NOT REPRESENTING ANY ORDER FOR INTERNAL NODE ,, SO WHY ALL THEY TAKE MAXIMUM OF 2 NODES IN INTERNAL NODE????.
AS QUESTION DOESNT SPECIFY ANYTHING WE CAN TAKE 3 NODES AS ONLY STATEMENT