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8th Class Mathematics Related to Competitive Exam Question Bank Series

  • question_answer
    3, 6, 24, 30, 63, 72, ?, 132

    A) 42                               

    B) 58

    C) 90                               

    D) 120

    Correct Answer: D

    Solution :

    Terms taken alternately form two sequences. These are
    \[3,24,63?\] \[6,30,72,132\]
    \[3={{2}^{2}}-1\] \[6={{2}^{2}}+2\]
    \[24={{5}^{2}}-1\] \[30={{5}^{2}}+5\]
    \[63={{8}^{2}}-1\] \[72={{8}^{2}}+9\]
    Next term  \[={{11}^{2}}-1=120\]


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