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A=1+2+2*2+2*3+..................+2*103
Varog repde


Răspuns :

A=1 + 2+2*2+2*3+..................+2*103 =

  =1+2*(1+2+3+ ... + 103) = 1 + 2* (103*104) / 2 = 1 + 10712 = 10713

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               suma Gauss