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Problem
Problem
If `
2
n
+
1
P
n
−
1
:
2
n
−
1
P
n
=
7
:
10
‘
,
t
h
e
n
‘
{}^{2n+1} P_{n-1} : {}^{2n-1} P_n = 7 : 10` , then `
2
n
+
1
P
n
−
1
:
2
n
−
1
P
n
=
7
:
10‘
,
t
h
e
n
‘
^n P_3` equals a. 60 b. 24 c. 120 d. 6
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