What is it that comes-

  • Once in a year
  • Twice in a month
  • Three times in a week
  • Four times in a day?
  • $\begingroup$ I wonder if this has to do with the date/time it was posted: 2018-01-28 within half an hour of 12:08 GMT. $\endgroup$
    – ngn
    Commented Jan 28, 2018 at 20:02

1 Answer 1


Perhaps the answer is:

The letter R.


It appears once in a yeaR.
Twice in a month, FebRuaRy.
Three times in a week, Sunday, Monday, Tuesday, Wednesday, ThuRsday, FRiday, SatuRday
Four times in a day:
    One a.m., Two a.m., ThRee a.m., FouR a.m., Five a.m., Six a.m.,
    Seven a.m., Eight a.m., Nine a.m., Ten a.m., Eleven a.m., Twelve p.m. (Noon),
    One p.m., Two p.m., ThRee p.m., FouR p.m., Five p.m., Six p.m.,
    Seven p.m., Eight p.m., Nine p.m., Ten p.m., Eleven p.m., Twelve a.m. (Midnight)

  • 27
    $\begingroup$ It seems to me that if the rule for "a week" here were applied consistently, then the answer for "a year" would have to be 9. Your answer may very well be right, but if so then the question falls in XKCD 169 territory for me. $\endgroup$
    – Gareth McCaughan
    Commented Jan 28, 2018 at 14:17
  • 4
    $\begingroup$ This puzzle feels like a rip off $\endgroup$
    – prog_SAHIL
    Commented Jan 28, 2018 at 15:43
  • 4
    $\begingroup$ Doesn't work if you use the 24 hour clock, though. $\endgroup$
    – jpmc26
    Commented Jan 28, 2018 at 21:32
  • 1
    $\begingroup$ Seems a little arbitrary - would this answer not be wrong 11 months out of 12? $\endgroup$
    – Scott
    Commented Jan 29, 2018 at 0:44
  • 2
    $\begingroup$ I guess, 'inconsistent'. The puzzle this is based on, the puzzle is consistent - the same explanation explains all the lines. This answer uses a different explanation for line 1, and line 2, and lines 3+4, (which share a solution with each other). $\endgroup$
    – Scott
    Commented Jan 29, 2018 at 0:52

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