8
If you have two pennies, the probability of both coming up heads when flipped is 1 in 4.
Added 10/16/2014 5:40:35 PM
This answer has been confirmed as correct and helpful.
8
An archaeologist studies human activity, from the development of the first stone tools in eastern Africa 4 million years ago up until recent decades.
Added 10/16/2014 5:42:30 PM
This answer has been confirmed as correct and helpful.
