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In the month of March 2019, find the days on which the date is a multiple of 5. (see the given page of the calendar).

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Dates which are multiple of 5: 

5,10, 15,20,25,30 

∴ S = {Tuesday, Sunday, Friday, Wednesday, Monday, Saturday} 

∴ n(S) = 6 

∴ The days on which the date will be a multiple of 5 are Tuesday, Sunday, Friday, Wednesday, Monday and Saturday.

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