The series of positive integer is grouped into fours as follows :

(1,2,3,4),(5,6,7,8),(9,10,11,12),...

Show that the sum of the integers in the k th bracket is 2(8k-3) .

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- Feb 23rd 2009, 05:23 AMthereddevilspositive integer
The series of positive integer is grouped into fours as follows :

(1,2,3,4),(5,6,7,8),(9,10,11,12),...

Show that the sum of the integers in the k th bracket is 2(8k-3) . - Feb 23rd 2009, 05:38 AMJester