A mint prepares metallic calendars specifying months,
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 for all the possibilities in future years?

Solution:

The first day of the year can be any one of the days of the week, i.e the first day can be selected in 7 ways.

But, the year could also be a leap year.

So, the mint should prepare 7 calendars for the non-leap year and 7 calendars for the leap year.

So, total number of calendars that should be made = 7 + 7 = 14

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