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?
According to the given question, there can be four types of month possible. Months with 30 or 31 days for normal months and for February it can be 28 or 29 days
Now for the months, it can start from any of one day of the week, so there are 7 possibilities.
Hence, the number of types calendars should it prepare to serve for all the possibilities in future years is 7 × 4 = 28