Monday = 0617
Tuesday = 0729
Wednesday = 9312
Thursday = 8412
Friday = 6511
Saturday = 8614
Sunday = ????
ANSWER:
Pattern is write the total number of letters in day then write what is the order of day, then add the sum of letters and order number
So Sunday is 6 letters, it is 7th day of the week, and sum of both is 13, then answer is 6713 which can replace the sunday.
Brain Teaser Questions 