Which one is correct?
A) In the beginning of the week
B) In the start of the week
Or it's just a matter of style?
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Mostly, it is a matter of style, but the answer depends somewhat on the context. Usually, one would use "at" instead of "in." "In the beginning of the week" is also acceptable depending on what you're describing, but "In the start of the week" sounds unnatural to a native speaker, because "start," unlike "beginning," has a meaning that is more related to the instant something begins.
I found all of these phrases in The New York Times using Google:
At the beginning of the week they were a tentative bunch
At the start of the week, that sounds pretty great.
The gain might have been wider, retailers said, had the period of cool weather in the beginning of the week been extended.
So you can be assured that those three uses are acceptable, but again, you probably want to use "at" instead of "in."