Answer :

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Let M be the collection of months with 31 days.

By applying roster method ;

M = {Januray, March, May, July, August, October, December}

We know that earth takes 365 days for one revolution. To make an equitible distribution in accordance to months, ( for international reference) this calender was created.
We must put the months of the year with 31 days in a "bag".
This "bag" will be called M (like months).

M= {Januray, March, May, July, August, October, December}

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