Number Sequence
Started by Bill. MC, 2nd April 2019 23:24 in Science & Astronomy

  1. #1 | 2109893
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    Default Number Sequence

    2 3 7
    4 5 23
    6 7 47
    8 9 79
    9 10 x

    What number is x?

  2. #2 | 2109897
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    Default Re: Number Sequence

    Bill. MC
    What number is x?
    99
    They who walk in silence hang the innocent and set the guilty free.
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  3. #3 | 2109912
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    Default Re: Number Sequence

    yeah.....99.

    Took a bit of figuring though......plaudits to sphinx....clearly not senile just yet.
    Liked by: sphinx


  4. #4 | 2109922
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    Default Re: Number Sequence

    98
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  5. #5 | 2109924
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    Default Re: Number Sequence

    Why would it be 98?

    It the 3rd number is the multiplication of the first 2 + X, where X starts at 1, and goes up in increments of 2,

    1, 3, 5, 7, '9'

  6. #6 | 2109925
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    Default Re: Number Sequence

    BobBobson
    Why would it be 98?

    It the 3rd number is the multiplication of the first 2 + X, where X starts at 1, and goes up in increments of 2,

    1, 3, 5, 7, '9'
    In the completed examples the first and second number also go up by increments of 2, but in the example we're given they've only gone up by 1. That's the trick part of the problem. 9 would added to the sequence starting 10 11. The answer to that would be 119.

    Calling the first number a, the second b and the solution x, then

    (a x b) + (a - 1) = x

    This gives 98 and also works for all the examples.
    Please note that any abuse in this post is both intentional and deserved.

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  7. #7 | 2109929
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    Default Re: Number Sequence

    Fork Me
    In the completed examples the first and second number also go up by increments of 2, but in the example we're given they've only gone up by 1. That's the trick part of the problem. 9 would added to the sequence starting 10 11. The answer to that would be 119.

    Calling the first number a, the second b and the solution x, then

    (a x b) + (a - 1) = x

    This gives 98 and also works for all the examples.
    Yep...

    I guess you got it.

    But anyone who includes that in a test paper and who marks 99 as the wrong answer........is a cünt.
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  8. #8 | 2109930
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    Default Re: Number Sequence

    BobBobson
    Yep...

    I guess you got it.

    But anyone who includes that in a test paper and who marks 99 as the wrong answer........is a cünt.
    It is unlikely to be in a test paper. Examiners are now required not to put in trick questions.
    Please note that any abuse in this post is both intentional and deserved.

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  9. #9 | 2109931
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    Default Re: Number Sequence

    Having said that. Students are now taught about number sequences and to look for a formula to show the relationship so, hopefully, they would be less likely to make the same mistake as our generation.
    Please note that any abuse in this post is both intentional and deserved.

    Anyone that feels the need to further point out that it contains abuse is clearly a total fucking moron who's also insulting YOUR intelligence by pointing out the bleeding obvious as if you were too fucking dumb to notice it.

    This has been a public service annoncement by Fork Me. Have a nice fucking day.

  10. #10 | 2109936
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    Default Re: Number Sequence

    Fork Me
    Having said that. Students are now taught about number sequences and to look for a formula to show the relationship so, hopefully, they would be less likely to make the same mistake as our generation.
    When I was studying for my Higher Maths some 25 years ago, I always thought the older past papers were harder....

    ....same subject matter, but getting on the right track was more obscured.

    .......newer papers, much more laid out on a silver platter, at least for any student who had done their homework.

 


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