Answer
The answer is ODD NUMBERS …
Explanation:
once in a year ..
we get 1 new year in every year. ( 2016)
[take odd number out.. here is only 1 ] (once)
Twice in a month ..
we get 4 new weeks in a month ..
[4 weeks means 1,2,3,4 .. take odd number out 1,3 ] (twice)
Four Times in a week ..
we get 7 new days in every weeks ..
[7 days means 1,2,3,4,5,6,7 .. take odd number out 1,3,5,7 ] (four times)
Six Times in a day ..
we get 12 new hours in every day ..
[12 hours means 1,2,3,4,5,6,7,8,9,10,11,12 .. take odd number out 1,3,5,7,9,11 ] (six times)