Problem $1$; A small world with too many chosices $(6$ prints$)$ and Up mowre slong the grid.

Hind I: Think of a path as a bihary pattern.

Hint & To get to the food, Chanel must go througin either point $A$ of point $B,$ but never both.

Wiustrate the use of the product rule and the nodition swbe to ubtain your answer. Explain hoon exch rake is manifested. Be concise but clear $($thanks$).$