If February 21, 1999 was Sunday, what day of the week was on December 30, 1997?
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Odd day in December month of 1997 = 1.
Odd day in year 1998 = 1.
odd day in year 1999 till 20th Feb = odd days in Jan = 3 + 20 ( odd days of Feb).
Total odd days = 1+1+3+20 = 25/7= 4.
So, Dec 30 1997 = Tuesday
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According tp the questions :
The year during this interval was 1998 and it was not a leap year. Now, we calculate the no. of odd days in 1999 up to February 19 :
January 1999 gives 3 odd days
20 February 1999 gives 5 odd days
1998, being ordinary year, gives 1 odd day
In 1997, December 30 and 31 give 2 odd days
Total no. of odd days = 3 + 5 + 1 + 2 = 11 days = 4 odd days
Therefore, December 30, 1997 will fall 4 days before Sunday i.e. on Wednesday.
Hence the answer is Wednesday
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