Question

Let T denotes 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 =
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Answer 1

Answer:

0

Step-by-step explanation:

take lhs and rhs

Multiply both sides by 0

LHS=RHS

Therefore hence since proved

teacher happy examiner happy

Answer 2

Answer:

I hope it will help you 3