Answer: Option A
Answer: (a)
18th September 1991 means,
1990 complete years + 8 months of 1991 + 18 days of September
Number of odd days in 1600 yrs = 0
Number of odd days in 300 yrs = 1
Number of odd days in 90 yrs (22 leap year + 68 ordinary years )
= 22 × 2 + 68 × 1
= 44 + 68 = 112
⇒ 0 odd days
Number of odd days in 1991,
January
3
February
0
March
3
April
2
May
3
June
2
July
3
August
3
September
4
= 3 + 0 + 3 + 2 +3 + 2 + 3 + 3 + 4
= 23 = 7 × 3 + 2
= 2 odd days
Total number of odd days till 18th September, 1991
= 0 + 1 + 0 + 2 = 3
So, the required day was Wednesday.