The most reliable muscle growth seems to come from training with sets between 5 and 30 repetitions, so long as each working (non- warm-up) set is taken close to failure (RIR 4 or less), anywhere in this range is highly effective. That being said, if you do as few as 2 reps per set and as many as 50 in some special cases, you may still get highly effective muscle growth.
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