Let Tn denote the number of triangles which can be formed by using th – McqOptions

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1.	Let Tn denote the number of triangles which can be formed by using the vertices of a regular polygon of n sides. If Tn+1 - Tn = 21, then n equals:
A.	5
B.	7
C.	6
D.	4
Answer» C. 6

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