Thursday, November 3, 2011

OBQ 314: What is X?

In the first column what is X? Tough one if you think hard!
       
               X  
                  Year
1
1804
2
1927
3
1960
4
1974
5
1987
6
1999
7
                    2011
Answer: I thought this was easy! X is the world population in billion.
       

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