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Mathematics
Mathematics
Problem
If
a
i
,
i
=
1
,
2
,
3
,
4
a_i, i = 1, 2, 3, 4
a
i
,
i
=
1
,
2
,
3
,
4
be four real members of the same sign, then the minimum value of
∑
a
i
a
j
,
i
,
j
∈
{
1
,
2
,
3
,
4
}
,
i
≠
j
\sum \frac{a_i}{a_j}, i, j \in \{1, 2, 3, 4\}, i \neq j
∑
a
j
a
i
,
i
,
j
∈
{
1
,
2
,
3
,
4
}
,
i
=
j
is: (a) 6 (b) 8 (c) 12 (d) 24
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