A mint prepares metallic calendars specifying months,dates and days in the form of monthly sheets(one plate for each month).How many types of calendars should it prepare to serve all the possibilities in future years?

Question

A mint prepares metallic calendars specifying months,dates and
days in the form of monthly sheets(one plate for each month) How
many types of calendars should it prepare to serve all the
possibilities in future years?

Kalpala Sameer Kumar · Answer

there are 2 possibilities for the number of days in february as
it can have 28 days or 29 days in the leap years
Also the first day of the month can be any one of the seven days
in a week
therefore no of february calendars = 2*7=14