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The recommended technique for performing CPR on an adult involves a cycle of 30 chest compressions followed by 2 rescue breaths. This combination of compressions and breaths aligns with guidelines established by organizations like the American Heart Association.

The rationale behind this sequence is that the chest compressions help maintain blood flow to vital organs, delivering oxygen through the circulation even in the absence of breaths. The 30 compressions provide a sufficient rhythm and depth to optimize blood circulation during cardiac arrest. Following these compressions with 2 rescue breaths allows for oxygen to be introduced directly into the lungs, which is critical to support the victim's breathing process. This cyclical method ensures that both circulation and ventilation efforts are balanced, enhancing the effectiveness of the CPR performed.

Using different sequences, such as fewer compressions or a varying number of breaths, would not adhere to established guidelines and could compromise the efficiency of lifesaving efforts.