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JEE MATHEMATICS MCQ: PERMUTATIONS

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Application +4 | -1

Let

T_n

denote the number of triangles which can be formed by using the vertices of a regular polygon of

n

sides. If

T_{n+1}-T_n=28

, then

n

equals

View answer and explanation

Correct option: D

8

The correct answer is D (8) because solving the equation derived from the given condition

T_{n+1} - T_n = 28

yields n = 8.

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