Math New Drill (Level 1) : Single stroke drawing

This figure is drawn with a single stroke of the brush. 

How many ways of drawing are there in all?


Answer
12 ways

Solution

Starting to draw from A or B.

When starting to draw from A, there are three ways of drawing direction. 

At B there are two ways of direction.

Therefore, there are 2 × 3 × 2 = 12 ways in total.






Which figures can be drawn by single stroke ?


Answer
 ②and ④