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multiples of 12
12th month = once a year
12th and 24th day of the month = twice a month
I guess among the options this is the one who makes more sense according to question. (Hope so!)
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The answer is "odd numbers".
There are 6 odd hours in a day-1,3,5,7,9,11.
There are 4 odd days in a week-1,3,5,7.
There are 2 odd weeks in a month-1,3.
AND THESE ALL APPEARS ONCE A YEAR.
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