A number theory problem by sudoku subbu

A POSTMAN HAS TO DELIVER 5 LETTERS TO 5 DIFFERENT PLACES. MISCHIEVIOUSLY HE POSTS ONE LETTER TO EACH PLACE WITHOUT SEEING WHETHER IT WAS THE CORRECT PLACE. IN HOW MANY DIFFERENT POSSIBLE WAYS COULD HE DO THIS SO THAT EXACTLY TWO OF FIVE PLACES RECEIVE CORRECT LETTERS.

×

Problem Loading...

Note Loading...

Set Loading...