What is the number of instructions that can be created with O-address and 1-address formats?

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It is impossible to determine the exact number of instructions that can be created with just the information that they use O-address and 1-address formats. The number of instructions will depend on many factors such as the instruction set architecture (ISA) and the specific design choices made by the system designers. Generally, modern ISAs support hundreds of instructions with various address formats to cover a wide range of operations.