Answer :
Finally after a lot of thoughts I got to this result
*The answer is odd numbers. (Weird but there's explanation)
*YEAR~12 the number '1' is odd so साल में बस एक बार
*MONTH~Four weeks, so there's '2' odd weeks '1' and '3'so महीने में दो बार
*WEEK~ Seven days 1,3,5 and '7' are odd so हफ्ते में चार बार
*DAY~12 hours 1,3,5,7,9,11 are odd so दिन में छे बार
*The answer is odd numbers. (Weird but there's explanation)
*YEAR~12 the number '1' is odd so साल में बस एक बार
*MONTH~Four weeks, so there's '2' odd weeks '1' and '3'so महीने में दो बार
*WEEK~ Seven days 1,3,5 and '7' are odd so हफ्ते में चार बार
*DAY~12 hours 1,3,5,7,9,11 are odd so दिन में छे बार