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Re: [obm-l] SOMA




Achar a soma S= 1 + 2.2 + 3.2^2 + 4.2^3 + 5.2^4 + ... + 100. 2^99
Esse basta vc desmembrar em varias PGs de razao 2
 
1+ 2 +4 +...
     2 +4 +...                                 =
          4 +...

=(2^100 -1) + 2(2^99 -1) + 4(2^98 -1) + ... + 2^98(2^2 -1) + 2^99(2 -1)=
100*2^100- (1+2+4+...+2^99) = 100*2^100 - 2^100 +1= 99*2^100 + 1
 
Abracos
Vinicius Meireles Aleixo

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