Question 12
Julia has a chocolate bar made of N small squares. At each step she eats N/2 squares if the current number N is even, and (N+1)/2 if it is odd. After four successive eating steps she has finished the bar. How many values can the initial N have?
Editorial interpretation: These are four actual eating steps; the bar first becomes empty on the fourth step.
Editorial interpretation: These are four actual eating steps; the bar first becomes empty on the fourth step.