Thread: how many reps/sets for building size and strength?

All of the rep ranges you noted will give you both a combination of strength and size, with strength being dominant closer to the 4-rep range and hypertrophy closer to the 8-10 rep range. For the most part try to hit reps in the 6-10 range, as most unexperianced lifters will become both bigger and stronger using those reps.

3 sets is good, but people usually just religiously do 3 sets of everything all the time, no matter what. If you think you can stimulate a muscle enough with one set, than thats all you need.

training for strength + size... between each sets you would rest about 1 min +

Ditto to above. 6-10 range. Try forced reps from time to time

Training for strength, 5x5. Add 3 sets of 15 reps, for hypertrophy, after your 5x5 sets. So your one exercise in your workout might look like this:

Benchpress-
235 5sets x 5reps
165-3 sets x 15reps