Either it was lost in translation or it is unclear(if mine, explain what I'm missing that makes it so obvious so I can learn from my mistake).
I will explain the error, or possible ambiguities, in the exercises.
How is this performed? The following image are 4 potential ways I could interpret this. Note these are my interpretations, some here think I am asking about how to play them, I know how to play them, as I created them using the above example. I am talking about how to interpret the example above with one single downbow on beat 1 and no other beats. The following are the possible interpretations. I am not saying they are "correct" but that without a correct/standardized rule, one cannot surely know, there are an infinite other interpretations, many not very logical too.
Or take one long bow, change when one wants?
The standard "method" is to down up down up on the quarters. But that is quite fast bowing. Or do we do a sort of "accent" while bowing in the same direction to get each subdivision?