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22 June, 08:22

Sum of odd numbers from 1 to 100?

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  1. 22 June, 08:41
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    Series would be: 1,3,5 ... 99

    Here, a=1, d = 3-1 = 2, l = 99

    l = a + (n-1) d

    99 = 1 + (n-1) 2

    98 = 2n-2

    2n = 100

    n = 50

    Sum would be Sn = n/2 (a+l)

    50/2 (1+99)

    25 (100) = 2500

    So, your answer is 2500
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