create linked list 10 -> 6 -> 8 -> 4 -> 12
push ( head , 12 ) ; push ( head , 4 ) ; push ( head , 8 ) ; push ( head , 6 ) ; push ( head , 10 ) ; int n = 2 ; Console . WriteLine ( " Sum ▁ of ▁ last ▁ " + n + " ▁ nodes ▁ = ▁ " + sumOfLastN_NodesUtil ( n ) ) ; } }