Mankind has existed for about 106 years whereas the universe is about 1010 years old. If the age of universe is taken to be one day, for how many seconds has the mankind existed?
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Q3
How many days are present between the years 2005 and 2008 including these years?
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Q4
How many days are present from year 2005 to 2008 including these years?
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Q5
Which day is called a leap day? After how many years does a leap year repeat itself?