P
x
=
(0 < k < N, 0 < n < N)
k
C
x
·
N – k
C
n – x
N
C
n
sin ic = (1 < n
12
)
1
n
12
55
56
V
e
= BR ( , B, R > 0)
υ
υ
57
P
nRT
V
= (n, T, V > 0)
58
V
nRT
P
= (
n, T, P
> 0)
59
T
PV
nR
= (P, V, n > 0)
60
n
PV
RT
= (P, V, T > 0)
61
62
W = LI
2
(L, I > 0)
1
2
S = s(s – a)(s – b)(s – c), s =
a + b + c
)
(
a + b > c
> 0
b + c > a
> 0
c + a > b
> 0
52
S =
(r G 1)
a (r
n
–1)
r – 1
53
Q = mcT
54
2
50
y
=
e
– x
x > 0
λ
λ
y
= 0
x
< 0
( > 0)
λ
51
(
)
P
x
= ( 1 – P)
x
P
x = 0, 1, 2······
0 < P < 1
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