question_answer

The integers 1 to 80 are written on a blackboard. The following operation is then repeated 79 times: In each repetition, any two numbers say p and q, currently on the blackboard are erased and a new number \[p+q-3\] is written. What will be the number left on the board at the end?

A)  3003

B)  3082

C)  3161                           

D)  3001

E)  None of these