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Q. Which method replaces NaN with a specified value in a DataFrame or Series?
  • (A) fillna()
  • (B) replace()
  • (C) dropna()
  • (D) isna()
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✅ Correct Answer: (A) fillna()

Explanation: fillna() is used to fill missing values (NaN) with a specified value.

Explanation by: Sikhar Chaudhary
fillna() is used to fill missing values (NaN) with a specified value.

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