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13 December, 21:41

how do i do this? 1+3+5+7 + ... + 101

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  1. 13 December, 22:35
    0
    Total numbers from pattern=51

    First number+last number is 1+101=102

    second number+second last number is 3+99=102.

    This means that we can form pairs that make up 102.

    Number of pairs=50/2=25

    The remaining middle number is 26

    Total value of pair=25*102

    Total sum of pattern=25*102+26=
  2. 13 December, 22:45
    0
    Hello,

    Number of terms in 1+3+5+7 + ... + 101

    nb = (101-1) / 2+1=51

    Sum = ((1+101) * 51) / 2=51²=2601
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