4 1-31.  Add:     111₂ +  001₂ 1.       100₂ 2. 1010₂ 3. 1001₂ 4. 1000₂ 1-32.  Add:     100₂     010₂ +  001₂ 1. 1000₂ 2. 1001₂ 3.       101₂ 4.       111₂ 1-33.  Add:   11010₂       100₂ +    111₂ 1. 011110₂ 2. 101010₂ 3. 100101 4. 111001₂ 1-34.  Which of the following rules of binary subtraction is correct? 1.     0 - 0 = 0 with a borrow 2.     1 - 0 = 0 3.     2 - 1 = 1 4.     1 - 0 = 1 1-35.  In the following example, which number is the minuend?     10110₂ –    1100₂ 1. 10110₂ 2.      1100₂ 3.      1010₂ 4. 10101₂ 1-36.  Which of the following rules of binary subtraction requires the use of a borrow? 1.    0 - 0 2.    1 - 0 3.    1 - 1 4.    0 - 1 1-37.  In binary subtraction, what is the value of a borrow when it is moved to the next lower order column? 1.      1₂ 2.      2₂ 3. 10₂ 4. 10₁₀ IN ANSWERING QUESTIONS 1-38 THROUGH 1-40, PERFORM THE INDICATED OPERATION. 1-38.  Subtract:      11111₂ –   10101₂ 1. 10100₂ 2. 11010₂ 3. 00101₂ 4. 01010₂ 1-39.  Subtract:    10101₂ –   1111₂ 1. 00110₂ 2. 01001₂ 3. 01100₂ 4. 00010₂