From a sample of 250 data scientists, determine the ratio of those proficient in Python to those proficient in R. Category Number of Data Scientists Proficient in Python and R 50 Proficient in Python only 80 Proficient in R only 70 Proficient in neither language 50 Total Sample Size 250

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1. Count Python users: $80 + 50 = 130$.  
2. Count R users: $70 + 50 = 120$.  
3. Form the ratio: $130:120$.  
4. Simplify by 10 to get $13:12$.  
FINAL_ANSWER: a

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