5-3-1

Could you clarify what you mean by "5-3-1"? It could be:

• Arithmetic: 5 − 3 − 1 = 1
• 5/3/1 training program (Wendler): a powerlifting program with a 4-week cycle and specific set/rep schemes
• Something else (e.g., a rule or concept in another subject)

If you meant the math one, the answer is 1 (since (5 − 3) − 1 = 1).

If you want, I can give a quick overview of the 5/3/1 program (weekly sets/reps, progression, deloads) or tailor a study aid for whichever topic you’re studying. Which would you like?