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7th Class Mental Ability Mathematical Reasoning Question Bank Mathematical Reasoning

  • question_answer
    Identify the rule and find the missing number in place of the question mark.
    6 15 35
    77 143 221
    323 437 ?

    A)  657       

    B)  663       

    C)  667          

    D)  700

    Correct Answer: C

    Solution :

     This is a series of numbers each number is obtained by multiplying the two successive prime numbers 2, 3, 5, 7, 11, 13, 17, 19, 23 etc. The number required is\[23\times 29=667\].


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