T ( n ) = n T 1 + n ( n +1 ) 2 ( T 2 + T 3 ) = n 2 + n 2 T 2 + n 2 + n 2 T 3 + n T 1 T ( n ) = n 2 2 ( T 2 + T 3 ) + n 2 ( T 2 + T 3 ) + n T 1