Question

Smt. Indira Gandhi died on 31st October, 1984. The day of the week was

• A. Monday
• B. Tuesday
• C. Wednesday
• D. Friday

Answer 1

The correct option is C Wednesday

1600 years contain 0 odd day, 300 years contain 1 odd day. Also, 83 years contain 20 leap years and 63 ordinary years and therefore (40+0) odd days i.e., 5 odd days.
$\therefore$ 1983 years contain (0+1+5) i.e., 6 odd days.
Number of days from Jan. 1984 to 31st Oct. 1984
$=(31+29+31+30+31+30+31+31+30+31)$
$=305days=4odd$ days
$\therefore$ Total number of odd days $=6+4=3$ odd days.
So, 31st Oct, 1984 was Wednesday.