Twenty-five sticks, five of which consist of virtual coils. How to calculate the formula?
The formula that five of the 25 sticks are circled by imaginary can be expressed as: 5+(25-5)=25. Among them, 5 represents five sticks that are virtually coiled, and 25-5 represents 20 sticks that are left after the five sticks that are virtually coiled are removed. So the formula that five of the 25 sticks are circled by imaginary coils is 5+(25-5) = 25.