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Mathematics
Problem
Which one of the following identities expresses the symmetry property of binomial coefficients? a)
(
n
k
+
1
)
\displaystyle {n \choose k+1}
(
k
+
1
n
)
b)
(
n
n
−
k
)
\displaystyle {n \choose n-k}
(
n
−
k
n
)
c)
(
n
+
1
k
)
\displaystyle {n+1 \choose k}
(
k
n
+
1
)
d)
(
k
n
)
\displaystyle {k \choose n}
(
n
k
)
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