Solve this and let me know...

Ek aur questn.
Wo kya cheez he jo saal me ek baar,mahine me 2 baar aur din me 4 baar aati he.

Answer
# 5Ans Is "F"
In a year, there are 12 months, starting 
from January to
December. F comes one time only in February
In months, there are Four weeks.
Starting from first week to
fourth week. So "F" comes two times in 
First week and fourth
week. It do not comes in second and third 
week.
In a week there are seven days. Starting 
from first day to
seventh day. That is first day, second day, 
third day, fourth
day, fifth day, sixth day and seventh day. 
So f comes 4 times
in week.( first, fourth, fifth).
And in a day, There are 24 hours. Starting 
from One to Twenty
four. So F comes 6 times in days( four, 
five,fourteen, fifteen,
twenty four).