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Anonymous
Anonymous asked in Science & MathematicsMathematics · 1 decade ago

What is the missing number: 1/2,1/12,1/30,1/56,1/?,1/132?

6 Answers

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  • Sparks
    Lv 6
    1 decade ago
    Favorite Answer

    (12 - 2) = 10

    10 + 8 = 18

    18 + 12 = 30

    -------------------

    (30 - 12) = 18

    18 + 8 = 26

    26 + 30 = 56

    -------------------

    (56 - 30) = 26

    26 + 8 = 34

    34 + 56 = 90

    -------------------

    (90 - 56) = 34

    34 + 8 = 42

    42 + 90 = 132

    ----------------------

    (Base - Previous Base) = x

    (x + 8) + Base = Next Base.

  • 1 decade ago

    Find the missing number in:

    1/2,1/12,1/30,1/56,1/?,1/132

    The missing number is 90.

    The pattern of the denominators is:

    1*2, 3*4, 5*6, 7*8, 9*10, 11*12

    = 2, 12, 30, 56, 90, 132

  • 1 decade ago

    1/2,1/12,1/30,1/56,1/?,1/132?

    12 = 2 +10

    30 = 12 + 18

    56 = 30 + 26

    ? = 56 + 34 = 90

    132 = 90 + 42

    each time you add 8 more. Bingo.

    the missing number is 90

    1/2,1/12,1/30,1/56,1/90,1/132

  • 1 decade ago

    12-2=10

    30-12=18

    56-30=26

    10,18,26 are at a difference of 8

    ?-56=26+8

    the next number is 26+8+56 which is 90.

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  • 1 decade ago

    1/2,1/12,1/30,1/56,1/90,1/132.....

  • 1 decade ago

    86?

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