Calendar – Day of week: Smt. Indira Gandhi died on 31 October 1984. What day of the week was it?

Introduction / Context:
Determining weekdays for historic dates is a classic calendar problem solvable via congruence formulas or anchor-day references. The query asks for the weekday of 31 October 1984.

Given Data / Assumptions:

• Date: 31 Oct 1984.
• Use the proleptic Gregorian calendar (modern standard).

Concept / Approach:
Methods include Zeller-like congruences, Doomsday algorithm, or verified anchor dates. By computing offsets for 1984 and stepping through month/day values, we identify the weekday.

Step-by-Step Solution:
1) 1984 is a leap year.2) Using an anchor-day approach (Doomsday of 1984 is Wednesday), and known doomsday dates in leap years (e.g., 10/10, 8/8), we offset to 10/31.3) The offset yields Wednesday.

Verification / Alternative check:
Cross-check with a reliable perpetual calendar or mental Doomsday method: both confirm Wednesday.

Why Other Options Are Wrong:
Monday, Tuesday, Friday → do not match the computed weekday for 31-10-1984.

Common Pitfalls:
Forgetting 1984 is a leap year or misapplying month offsets can shift the result by ±1 day.

Final Answer:
Wednesday