Must there be at least one friday the 13th in every
year? use division to answer this question. (you
may answer only for years that aren't leap years.)
to get started on solving this problem, answer the
following: if january 13th falls on a monday, then
what day of the week will february 13th, march
13th, and so forth, fall on? use division with
remainder to answer these questions. now con-
sider what will happen if january 13th falls on a
tuesday, a wednesday, and so on.

answer asap.