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Triangle inequality: which side triples or difference inequalities hold

This type of question, asked 2 times: CDS 1 2017, CDS 2 2019. All 2 questions below, oldest first.

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  1. Question 1

    CDS 1 2017

    70
    Which one of the following triples does not represent the sides of a triangle ?

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  2. Question 2

    CDS 2 2019

    89
    Consider the following inequalities in respect of any triangle ABC : 1. AC−AB<BCAC - AB < BC 2. BC−AC<ABBC - AC < AB 3. AB−BC<ACAB - BC < AC Which of the above are correct ?

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