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What did Petrov primarily base his decision on?

Previous experiences
Gut feeling
Protocol
Lack of corroborating evidence

Answer

Petrov primarily based his decision on the lack of corroborating evidence. Despite the early warning system indicating a nuclear attack, Petrov noticed that other detection systems did not confirm the threat. This discrepancy, coupled with the absence of additional radar signals or communications from higher authorities, led him to conclude that the warning was a false alarm.