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imc

number theory intermediate

Problem

Marvin had a birthday on Tuesday, May 27 in the leap year . In what year will his birthday next fall on a Saturday?
(A)
(B)
(C)
(D)
(E)
Solution
There are days in a non-leap year. There are days in a week. Since (or ), the same date (after February) moves "forward" one day in the subsequent year, if that year is not a leap year. For example: Tue Wed However, a leap year has days, and . So the same date (after February) moves "forward" two days in the subsequent year, if that year is a leap year. For example: Fri Sun You can keep counting forward to find that the first time this date falls on a Saturday is in : Mon Tue Wed Fri Sat
Final answer
E