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Solve this sequence anyone?

  • 27-09-2018 6:26pm
    #1
    finbarrk
    Registered Users, Registered Users 2 Posts: 5,494 ✭✭✭


    _,40,_,_,_,116
    It’s in my daughters Junior Cert homework and we can’t figure it out.


Comments

  • #2
    Daisy 55
    Registered Users, Registered Users 2 Posts: 517 ✭✭✭Daisy 55


    21,40,59,78,97,116


  • #3
    Johnnyhpipe
    Closed Accounts Posts: 748 ✭✭✭Johnnyhpipe


    Daisy 55 wrote: »
    21,40,59,78,97,116

    What is the logic to that? (Maybe I’m just stupid!)


  • #4
    eurokev
    Registered Users, Registered Users 2 Posts: 973 ✭✭✭eurokev


    Johnnyhpipe wrote:
    What is the logic to that? (Maybe I’m just stupid!)


    Starts at 21 and you keep adding 19 to the next number


  • #5
    finbarrk
    Registered Users, Registered Users 2 Posts: 5,494 ✭✭✭finbarrk


    Thanks Daisy. That was quick!


  • #6
    mighty magpie
    Registered Users, Registered Users 2 Posts: 981 ✭✭✭mighty magpie


    (116-40)/4
    where 4 is the number of gaps.


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  • #7
    MathsManiac
    Registered Users, Registered Users 2 Posts: 1,595 ✭✭✭MathsManiac


    In fairness, you'd have to have been told that the sequence was arithmetic in order for that solution to be valid.
    Otherwise, the problem has any number of solutions.


  • #8
    Iderown
    Registered Users, Registered Users 2 Posts: 233 ✭✭Iderown


    A step upping of the difficulty.
    Find the formula which gives rise to the values
    -, 40, -, 70, -, 116


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