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Problem
Problem
How many number of points of intersection of
n
n
n
straight lines, if
n
n
n
satisfies
n
+
3
P
n
+
1
=
11
(
n
−
1
)
2
×
n
+
3
P
n
{}^{n+3}P_{n+1} = \frac{11(n-1)}{2} \times {}^{n+3}P_n
n
+
3
P
n
+
1
=
2
11
(
n
−
1
)
×
n
+
3
P
n
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