Answer:
a) Please see below as the answer is self explanatory.
b) odd parity.
Explanation:
As the hexadecimal system, has as its base the decimal 16, which is the 4th power of 2 (base of the binary system), each hexadecimal digit can be expressed of a linear combination of 4 binary digits, as follows:
Hex = b₃*2³ + b₂*2² + b₁*2¹ + b₀*2⁰, where bₙ = 0 or 1.
So, we can convert the hexadecimal bit pattern to binary, as follows:
4A = 01001010
Now, if the leftmost bit is a parity bit, the ASCII code is represented by the 7 rightmost bits:
⇒ ASCII = 1001010 = 74
Repeating the same process for the remaining pairs of hex digits, we have:
EF = 11101111 ⇒ ASCII = 1101111 = 111
68 = 01101000 ⇒ ASCII = 1101000 = 104
20 = 00100000 ⇒ ASCII = 0100000 = 32
C4 = 11000100 ⇒ ASCII = 1000100 = 68
EF = 11101111 ⇒ ASCII = 1101111 = 111
E5 = 11100101 ⇒ ASCII = 1100101 = 101
b) Due to any pair of digits has an odd number of 1s, the parity used is odd parity.
