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.
lukasz Poland
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Very interesting!
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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
flagPoland
10%
31%
9%
48%
1640
flagthe United Kingdom
16%
27%
16%
38%
18
flagGermany
9%
27%
18%
45%
11