If there is Friday 13th in a month, then ...
this month has 30 or 31 days
this month starts on Sunday
this month ends on Sunday
All of the answers are correct
If 1st is Sunday then Friday is on 6th and 13th.
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Answers by country
this month has 30 or 31 days
this month starts on Sunday
this month ends on Sunday
All of the answers are correct
answers
Australia
21
the United States
46
Germany
31
the Netherlands
13
India
20
Poland
3009
Greece
11
the United Kingdom
58