QUESTION 2 Add binary number 1101 and 111 without converting them to decimal, the sum is Multiply these two binary numbers, the product is QUESTION 3 Convert the characters "8Ce3" to ASCII codes (7-bit for each character): QUESTION 4 What is the smallest signed number that can be expressed with 6 bits? What is the largest signed number that can be expressed with 6 bits? (if your answer is a positive value, do not type the sign of +. )