📊 Pandas
Q. Which method returns the first non-null value in each column?
  • (A) first()
  • (B) first_valid_index()
  • (C) bfill()
  • (D) ffill()
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✅ Correct Answer: (B) first_valid_index()

Explanation: The first_valid_index() method returns the index of the first non-null value for a Series or DataFrame column.

Explanation by: Sikhar Chaudhary
The first_valid_index() method returns the index of the first non-null value for a Series or DataFrame column.

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