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20 May, 21:49

Add the numbers from 1 to 100 by following the same steps you used in 1.

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  1. 20 May, 22:02
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    Summaation of a sequence

    or see a smaller scale

    from 1 to 10

    notice

    1+10=11

    2+9=11

    etc

    5+6=11

    10/2=5

    there are 5 pairs

    5*11=55

    so

    1 to 100

    1+100=101

    2+99=101

    ...

    50+51=101

    100/2=50

    there ar 50 pairs

    50 times 101=5050

    the sum is 5050
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