13_46_8_180_210_75 = 64. Use + and - take m = + and n = - . Find m-n ?

Solution: Place + or - signs between the numbers so the sum equals 64, then count how many plus signs (m) and minus signs (n) are used.

One valid arrangement is: 13 - 46 - 8 - 180 + 210 + 75 = 64

1. 13 - 46 = -33

2. -33 - 8 = -41

3. -41 - 180 = -221

4. -221 + 210 = -11

5. -11 + 75 = 64

• Signs between consecutive numbers (in order): -, -, -, +, +

• Count of plus signs (m) = 2

• Count of minus signs (n) = 3

Therefore, m - n = 2 - 3 = -1