CBSE 2023, Set 4

Question

**Assertion (A):** The output of addition of two series will be NaN, if one of the elements or both the elements have no value(s).

**Reason (R):** While performing mathematical operations on a series, by default all missing values are filled in with 0. A). Both (A) and (R) are true and (R) is the correct explanation for (A). B). Both (A) and (R) are true and (R) is not the correct explanation for (A). C). (A) is true and (R) is false. D). (A) is false but (R) is true.

Edvaya · Accepted Answer

The correct answer is (A) is true and (R) is false.. Assertion (A) is True: In Pandas, when performing arithmetic operations (like addition) between two Series, if an index is present in one Series but missing (or has `NaN`) in the other, the resulting calculation for that index evaluates to `NaN` (Not a Number). Reason (R) is False: By default, missing values are **not** filled with $0$. They remain `NaN` unless explicitly handled using methods like `.add(fill_value=0)`.

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Informatics Practices > Data Handling And Visualization > Data Handling Using Pandas

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