The memory size for n address lines and m data lines is given by 

The correct answer is 2n × m

Key Points

• In a basic memory unit (like RAM), the number of address lines determines the number of memory locations, and the number of data lines determines the size of each memory location.
  • The number of memory locations is given by 2ⁿ, where n is the number of address lines. This is because each address line can be either 0 or 1 - two possibilities. So with n lines, we have 2ⁿ possible combinations, each representing a different memory location.
  • The size of each memory location is determined by m, the number of data lines. Each data line can carry one bit of data. So, m data lines can carry m bits of data.
• Combining these two considerations, the total size of the memory is the number of memory locations multiplied by the size of each location in bits.
• So, total memory size = 2ⁿ memory locations × m bits/location