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Permutation under Restriction

Tm denotes th...

Question

$T_{m}$ denotes the number of Triangles that can be formed with the vertices of a regular polygon of $m$ sides . If $T_{m + 1} - T_{m} = 15$ then $m$ =

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Solution

The correct option is C $6$
$T_{m + 1} - T_{m} = 15$
By verification $m = 6$ by solve.

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