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Problem
Problem
The Solution set of
n
C
r
−
1
>
2
⋅
n
C
r
{}^nC_{r-1} > 2 \cdot {}^nC_r
n
C
r
−
1
>
2
⋅
n
C
r
, is a.
{
1
,
2
,
3
}
\left\{1, 2, 3\right\}
{
1
,
2
,
3
}
b.
{
4
,
5
,
6
}
\left\{4, 5, 6\right\}
{
4
,
5
,
6
}
c.
{
8
,
9
,
10
}
\left\{8, 9, 10\right\}
{
8
,
9
,
10
}
d.
{
9
,
10
,
11
}
\left\{9, 10, 11\right\}
{
9
,
10
,
11
}
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