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Thread: Odd natural numbers...

  1. #1
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    Odd natural numbers...

    Consider the pattern shown below:
    1
    3 5
    7 9 11
    13 15 17 19
    ...

    which number comes first in the 81st row?


  2. #2
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    Re: Odd natural numbers...

    hi

    is it 6641?

    :)
    NEVER SAY DIE.

  3. #3
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    Re: Odd natural numbers...

    NO...

    James


  4. #4
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    Re: Odd natural numbers...

    I think the answer is "6481"


    explanation

    the last number of each row is obtained by a formula


    row number* rownumber+the number of terms in prevoius row

    eg 2nd row : 2*2+1=5 (5 is last number of sec row)

    3rd row: 3*3+ 2=11(11 is the last number of third row)

    4 th row 4*4+3 =19(19..................................fourth row)

    ....

    ....


    80 th row 80*80+79=6479(6479...................80 th row)

    therefore fiirst number is 6481


    hope iam right?

    bye

    :)
    NEVER SAY DIE.

  5. #5
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    Re: Odd natural numbers...

    Good work buddy...


  6. #6
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    Re: Odd natural numbers...

    earlier i got the wrong answer

    since i found the last number of 81st row

    i did 81*81+80=6641.
    thats where i did mistake

    bye


    :)
    NEVER SAY DIE.

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