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Mathematics
Problem
State the relationship between
n
C
r
{}^{n}C_{r}
n
C
r
and
n
C
n
−
r
{}^{n}C_{n-r}
n
C
n
−
r
for any non-negative integers
n
n
n
and
r
(
0
≤
r
≤
n
)
r\,(0\le r\le n)
r
(
0
≤
r
≤
n
)
.
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