I want to know the answer to the following question:
What is the frequency of Haplogroup R1a in the Sorbs?
All the background I'm provided with is that "The correlation between R1a1a [M17] and the speakers of Indo-European languages, particularly those of Eastern Europe (Russian) and Central and Southern Asia, was noticed in the late 1990s.". Is that enough to answer the question?
Answer: no