Rhetorical question is one that expects no answer. It is asked in order to make a statement rather than to get a reply They are frequently used in dramatic situation and in publisistic style.
e. g. What was the good of discontented people who fitted in nowhere?
Litotes - is a device - an affirmation is expressed by denying its contrary.
Usually litotes presupposes double negation. One through a negative particle (no, not) the other - through a word with negative meanixig. Its function is to convey doubts of the speaker concerning the exact characteristics of the object or a feeling.
e.g. He was not without taste.