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Mathematics
Mathematics
Problem
Let
T
n
T_n
T
n
be the number of all possible triangles formed by joining vertices of an
n
n
n
-sided regular polygon. If
T
n
+
1
−
T
n
=
10
T_{n+1} - T_n = 10
T
n
+
1
−
T
n
=
10
, the value of
n
n
n
is a. 5 b. 10 c. 8 d. 7
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