1st answer:
Its simply the numbers of letters used in words
say,
ONCE=YEAR
4=4
TWICE=MONTH
5=5
FOUR=WEEK
4=4
SIX=DAY
3=3
2nd Answer:
Odd numbers...
Once in a year:- 200*9*
twice in every month:- 02 odd week 1 & 3.
4 times in a week:-four odd days in a week- 1, 3, 5, 7
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