For question Chapter 4, Problem 13E of The Essentials Of Computer Organization And Architecture (4th Edition):

A digital computer has a memory unit with 24 bits per word. The instruction set consists of 150

different operations. All instructions have an operation code part (opcode) and an address part

(allowing for only one address). Each instruction is stored in one word of memory.

a) How many bits are needed for the opcode?

b) How many bits are left for the address part of the instruction?

c) What is the maximum allowable size for memory?

d) What is the largest unsigned binary number that can be accommodated in one word of memory?

Part C in this says it's 2^16 x 24 , but my instructor says thats wrong, and its just 2^16?

For part D, the notes here say its 2^16 - 1, which is 65535, but my instructor says its 2^24 - 1.

Which is actually correct?