MEDIUM
Assam CEE
IMPORTANT
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The number of different ordered triples a,b,c,a,b,cN, such that these can represent the sides of a traingle with perimeter 18, is

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Important Questions on Permutation and Combination

EASY
Assam CEE
IMPORTANT
Let Tn denote the number of traingles which can be formed using the verticles of a regular polygon of n sides. If Tn+1-Tn=21, then n is equal to