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Which type of addressing mode, less number of memory references are required?

1. Immediate
2. Implied
3. Register
4. Indexed
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In this mode Operand  is specified in instruction itself. Hence no need of Memory reference also called Zero address instruction.
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In implied addressing mode the operand is specified in the instruction itself. Hence, there is no need of memory reference.

Whereas in all the other modes atleast $1$ memory reference(s) required.

$\therefore$ Option $2.$ is correct.
In Implied Addressing Mode , operand is always present in instruction itself.                                                      So,option 2 is correct