Multiple Choice Questions on p q and r are prime numbers such that p lt q lt r lt 13 In how many cases would p q r also be a prim........... for CDS Exam Preparation

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Multiple Choice Questions

p q and r are prime numbers such that p lt q lt r lt 13 In how many cases would p q r also be a prim...........

Quantitative Aptitude (CDS) Number System
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    p, q and r are prime numbers such that p < q < r < 13. In how many cases would (p + q + r) also be a prime number?

    1

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    2

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    3

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    None of these

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    Explanation:

    The prime numbers less than 13 are 2, 3, 5, 7, 11.
    Also, using the condition, p < q < r < 13 and p + q + r is a prime number
    Hence, only two possible pairs exist i.e. (3, 5, 11) and (5, 7, 11).

    By: Munesh Kumari
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