3 1-21.  The result of subtraction is known as the 1.     addend 2.     quotient 3.     difference 4.     subtrahend 1-22.  What are the (a) radix and (b) the symbols used in the binary number system? 1.     (a) 1   (b)     0, 1 2.     (a) 2   (b)     1, 0 3.     (a) 3   (b) 0, 1, 2 4.     (a) 0   (b)     1, 2 1-23.  Positional notation for the binary system is based on powers of 1. 1 2. 2 3. 3 4. 0 1-24.  What is the decimal equivalent of 2³? 1.       6 2.       2 3.       8 4. 10 1-25.  The decimal number 1 is equal to what power of two? 1. 2¹ 2. 2² 3. 2³ 4. 2⁰ 1-26.  Which of the following powers of two indicates a fraction? 1. 2¹ 2. 2⁰ 3. 2 -2 4. 2² 1-27.  Which digit is the MSD in the binary number 1011001? 1.     The 0 farthest to the left 2.     The 1 farthest to the left 3.     The 0 farthest to the right 4.     The 1 farthest to the right 1-28.  Which of the following combinations of binary addition is INCORRECT? 1.     1 + 1 = 1 with a carry 2.     1 + 0 = 1 3.     0 + 0 = 0 4.     0 + 1 = 1 IN ANSWERING QUESTIONS 1-29 THROUGH 1-33, PERFORM THE INDICATED OPERATION. 1-29.  Add:       10010₂ +    1010₂ 1. 10000₂ 2. 11100₂ 3. 10101₂ 4. 11010₂ 1-30.  Add:    11101₂ + 01001₂ 1.       11111₂ 2. 100110₂ 3. 111010₂ 4. 100000₂