I played that exercise (but not as much as I should have) under a teacher who generally used 1-2-4 in the lower octave. He did nevertheless advocate playing with the third finger as well, during this exercise, point being that the more you know, the better you get. He even made me start with the 4 on low A.
Good and reasonable point or no, I must say I liked the man. He's almost bald and pretty wise.
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