To find the week day on 2nd April, 1994, calculate odd days [... After 1900, No. of full year = 93] x = 93 [... There are 23 leap years between 1900 and 1994] y = 23 [... 1900 = (multiple years of 400) + 300] z = 1 [Jan. 31 + Feb. 28 + March 31 + April 2] No. of days = 92 x + y + z = 209 Total = 209 On dividing 209 by 7, remainder = 6 ∴ 2nd April, 1994, Sixth day after Sunday = Saturday Hence, inApril 1994 Sunday fall on 3, 10, 17, 24 dates.