Answer-first summary for fast verification
Answer: 0.52
The Inverse Document Frequency (IDF) is calculated as: $$IDF = \log\left(\frac{N}{df}\right)$$ Where: - N = total number of documents (sentences) = 2,718 - df = number of documents containing the term = 1,618 Calculation: $$IDF = \log\left(\frac{2718}{1618}\right) = \log(1.68)$$ Using natural logarithm: $$\ln(1.68) \approx 0.52$$ Therefore, the IDF is closest to 0.52.
Author: LeetQuiz Editorial Team
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A
0.52
B
0.60
C
1.68
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