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Combinatorics
medium
0:00.0
If
P
(
5
,
r
)
=
2
c
d
o
t
P
(
6
,
r
−
1
)
P(5, r) = 2 \\cdot P(6, r-1)
P
(
5
,
r
)
=
2
c
d
o
tP
(
6
,
r
−
1
)
, find
r
r
r
.
A
2
B
3
C
1
D
4
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