8th Class Mathematics Related to Competitive Exam Question Bank Series

  • question_answer
    DIRECTIONS: In each example on some letters are missing shown by (?.). The missing letters are given in proper sequence as one of the3 alternatives given under each question. Find out the correct alternative? 16, 33, 67, 135......

    A) 251                             

    B) 259

    C) 271                   

    D) 289

    Correct Answer: C

    Solution :

    Multiply each number in the series by 2, and then add '1' to get the next number, like \[(16\times 2+1)=33,(33\times 2+1)=67,\] and so on.         


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