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NTSE Sample Paper NTSE SAT Practice Test-16

  • question_answer
    If the numbers q, q + 2 and q + 6 are all primes then what can be the value of 3q + 9?

    A) 18                                

    B) 42

    C) 60                                

    D) 42 or 60

    Correct Answer: D

    Solution :

    [d] If \[3q+9=18\,\,\,\,\Rightarrow \,\,\,\,\,q=3\] So the three numbers are 3, 5 and 9. This is not true as 9 is not a prime number. But if 3q+ 9 = 42 or 60, we have q = 11 or 17. In this case, the numbers are 11, 13, 17 or 17, 19, 23 which is true.


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