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

Australia

66%

14%

the United States

61%

30%

Germany

50%

13%

27%

the Netherlands

46%

23%

India

20%

35%

10%

30%

Poland

10%

31%

48%

3091

Greece

27%

54%

the United Kingdom

19%

17%

11%

49%

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