Question

7. Remove three toothpicks to leave only three squares

Answer 1

Answer: See the diagram below

Step-by-step explanation:

There might be a formal method to approach these types of problems, but I used a trial and error process.

Figure 1 is the original diagram. Figure 2 shows the three red segments I'll be removing, and figure 3 is the result after removing those lines to get the final answer.

Answer 2

Remove these three :)