In an ordinary (non-leap) year, March begins on the same weekday as which pair of months?

Introduction / Context:
Month-start weekdays follow fixed offsets mod 7 that depend on whether the year is leap or common. The task is to match March's start day in an ordinary year.

Given Data / Assumptions:

• Ordinary (non-leap) year month offsets (mod 7) often used: Jan 0, Feb 3, Mar 3, Apr 6, May 1, Jun 4, Jul 6, Aug 2, Sep 5, Oct 0, Nov 3, Dec 5 (relative to a reference).

Concept / Approach:
Months that share the same offset begin on the same weekday.

Step-by-Step Solution:
From the standard offsets for a common year, March has offset 3.February also has offset 3 in a common year.November has offset 3 as well.Thus March begins on the same weekday as February and November.

Verification / Alternative check:
Check any common year calendar (e.g., 2021): Feb 1 and Mar 1 both occur on Monday; Nov 1 also on Monday.

Why Other Options Are Wrong:
Pairs listed do not both share March's offset in a common year.

Common Pitfalls:
Using leap-year offsets where February's alignment shifts.

Final Answer:
February and November