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Mankind has existed for about ${{10}^{6}}$ years whereas the universe is about ${{10}^{10}}$ year old. If the age of universe is taken to be one day, how many seconds has the mankind existed?
CBSE Class 11
CBSE Class 11 Physics
unitsandmeasurement
,
cbse
prasanna
August 15, 2016, 12:23pm
1