"If you cannot solve the proposed problem do not let this failure afflict you too much but try to find consolation with some easier success, try to solve first some related problem" -- G Polya
This thread shows a neat way of answering a question which comes up in university entrance interviews.
(Apologies for the lack of alt text -- I can't do symbols)
This thread shows a neat way of answering a question which comes up in university entrance interviews.
(Apologies for the lack of alt text -- I can't do symbols)