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[obm-l] Soma
To
: <
obm-l@xxxxxxxxxxxxxx
>
Subject
: [obm-l] Soma
From
: "Marcelo Roseira" <
mroseira@xxxxxxxxxx
>
Date
: Wed, 3 Jul 2002 16:33:08 -0300
Reply-To
:
obm-l@xxxxxxxxxxxxxx
Sender
:
owner-obm-l@xxxxxxxxxxxxxxxxxxxxx
Considere a soma:
1
3
+2
3
+3
3
+ ... + n
3
.
Ent�o, para todo n�mero natural
n
tem-se que ela �:
a) maior ou igual a n
4
.
b) maior do que n
4
/4.
c) igual a n(1+n
3
)/2.
d) menor do que n
5
.
e) menor do que n
4
.
Grato.
Marcelo.
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