Tuesday, August 26, 2008

Sequences

an=2n=2,4,6,8,10,12,14,16,18...


A series

(4i - 5) = - 1 + 3 + 7 + 11 + 15 + 19 = 54.


5(k + 2) = 5(k + 2) = 5[6 + 7 + 8 + 9] = 150.



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