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Math Help - Pattering help needed!

  1. #1
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    Pattering help needed!

    2. suppose that n is an odd integer, and the sum 1+3+5+7+..._(n-2)+n is 900 what is n?

    Also

    3. If 3+7+11+......+87=57k, find k.

    Any help would be thanked greatly
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  2. #2
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    1
    1+3 = 4
    1+3+5 = 9
    1+3+5+7 = 16
    1+3+5+7+9 = 25

    see a pattern on the right?


    3 = 1*3
    3+7 = 10 = 2*5
    3+7+11 = 21 = 3*7
    3+7+11+15 = 36 = 4*9
    3+7+11+15+19 = 55 = 5*11

    see another pattern on the right?
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  3. #3
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    Thanks for pointing that out but I'm still unsure
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  4. #4
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    Quote Originally Posted by Frankasd View Post
    Thanks for pointing that out but I'm still unsure
    You're meant to work out the pattern that gives the right hand side. Surely the first one is not so difficult to see .....

    The second is only slightly more difficult .....

    Please make an attempt.
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