SOLUTION: In a non-leap year that contains three Friday the 13ths, one of these Friday the 13ths must fall in a) July b) August c) September d) October e) November

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Question 1201549: In a non-leap year that contains three Friday the 13ths, one of these Friday the 13ths must fall in
a) July
b) August
c) September
d) October
e) November
Found 3 solutions by mananth, ikleyn, math_tutor2020:
Answer by mananth(16946)   (Show Source):
You can put this solution on YOUR website!
e) November
In a non-leap year, February, March, and November will all start on the same day of the week. If it ia Sunday you will get friday the 13th.

Answer by ikleyn(52814)   (Show Source):
You can put this solution on YOUR website!
.

In his response, @mananth forgot to point the link (web-site address),
from which he copied-pasted his response without a reference.

This link is THIS

https://www.google.com/search?q=In+a+non-leap+year%2C+February%2C+March%2C+and+November+will+all+start+on+the+same+day+of+the+week.&rlz=1C1CHBF_enUS910US910&oq=In+a+non-leap+year%2C+February%2C+March%2C+and+November+will+all+start+on+the+same+day+of+the+week.+&aqs=chrome..69i57.517j0j15&sourceid=chrome&ie=UTF-8

Answer by math_tutor2020(3817)   (Show Source):
You can put this solution on YOUR website!

Answer: e) November

Explanation:

This can be done through a trial-and-error approach.

Take a look at the calendar for 2009
https://www.timeanddate.com/calendar/print.html?year=2009&country=1&cols=3&df=1
then let's mark the 13th of each month

Month Day Month Day
jan 13th tue jul 13th mon
feb 13th fri aug 13th thu
mar 13th fri sep 13th sun
apr 13th mon oct 13th tue
may 13th wed nov 13th fri
jun 13th sat dec 13th sun

We have 3 instances of Friday the 13th.
They occur in:
February
March
November, which is the final answer

Further Reading
https://scienceworld.wolfram.com/astronomy/FridaytheThirteenth.html
https://www.timeanddate.com/calendar/weekday-friday-13