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#### mathworker

##### Well-known member

- May 31, 2013

- 119

E.G:

{1,2,3} is given then ,

1*1+1*2+1*3+2*2+2*3+3*3=s

how to find the general formula of SUM for given n-tuple containing consecutive natural numbers not necessarily starts with 1 or at least first N natural numbers